Issue 32182: Infinite recursion in email.message.as_string()

Sometimes RFC-correct email headers do not get folded correctly; the example code below results in an infinite recursion exception.

import sys
import mailbox
from email.message import EmailMessage
from email.headerregistry import Address
from email import policy

ePol = policy.SMTP.clone(refold_source='long',max_line_length=78)
msg = EmailMessage(ePol)
msg['From'] = Address("abcdefgh ijklnopq","a.ijklnopq","antani.com")
msg['To'] = (Address("abcdef.ghijklmno@pqrstuvwxyz12345678.it","abcdef.ghijklmnop","pqrstuvwxyz12345678.it"), Address("Jane Doe", "jane", "doe.com"))
msg['Subject'] = "Test"
msg.set_content("Body")
finalMail = msg.as_string()

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.6/email/message.py", line 968, in as_string
    return super().as_string(maxheaderlen=maxheaderlen, policy=policy)
  File "/usr/lib/python3.6/email/message.py", line 158, in as_string
    g.flatten(self, unixfrom=unixfrom)
  File "/usr/lib/python3.6/email/generator.py", line 116, in flatten
    self._write(msg)
  File "/usr/lib/python3.6/email/generator.py", line 195, in _write
    self._write_headers(msg)
  File "/usr/lib/python3.6/email/generator.py", line 222, in _write_headers
    self.write(self.policy.fold(h, v))
  File "/usr/lib/python3.6/email/policy.py", line 183, in fold
    return self._fold(name, value, refold_binary=True)
  File "/usr/lib/python3.6/email/policy.py", line 205, in _fold
    return value.fold(policy=self)
  File "/usr/lib/python3.6/email/headerregistry.py", line 255, in fold
    return header.fold(policy=policy)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 300, in fold
    self._fold(folded)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 1226, in _fold
    rest._fold(folded)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 338, in _fold
    if folded.append_if_fits(part, tstr):
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 149, in append_if_fits
    token._fold(self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 325, in _fold
    tstr = str(part)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in __str__
    return ''.join(str(x) for x in self)
  File "/usr/lib/python3.6/email/_header_value_parser.py", line 196, in <genexpr>
    return ''.join(str(x) for x in self)
RecursionError: maximum recursion depth exceeded while calling a Python object