Jens Troeger <jens.troe...@gmail.com> added the comment:
So that’s interesting. I thought that setting `international = True` (see line
https://github.com/python/cpython/blob/master/Lib/smtplib.py#L947) would be a
neat workaround, but the opposite.
When delivering those emails to Gmail I started seeing
Failed to send email: (555, b'5.5.2 Syntax error, goodbye.
s53-v6sm1864855qts.5 - gsmtp', 'f...@bar.com')
and it turns out (according to the IETF message linter,
https://tools.ietf.org/tools/msglint/) that:
-----------
UNKNOWN: unknown header 'User-Agent' at line 4
ERROR: missing mandatory header 'date' lines 1-7
ERROR: missing mandatory header 'return-path' lines 1-7
OK: found part text/plain line 9
WARNING: line 13 too long (109 chars); text/plain shouldn't need folding (RFC
2046-4.1.1)
WARNING: line 15 too long (124 chars); text/plain shouldn't need folding (RFC
2046-4.1.1)
WARNING: Character set mislabelled as 'utf-8' when 'us-ascii' suffices, body
part ending line 22
-----------
It seems that now “Date” and “Return-Path” header entries are missing when the
email is generated.
I reverted the initial change. Any updates on the multiple CR problem when
flattening?
----------
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<https://bugs.python.org/issue24218>
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