Author r.david.murray
Recipients barry, bsiem, maxking, r.david.murray
Date 2019-07-10.17:57:36
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Marked as misclassified Yes
Message-id <>
FYI, it would have been most helpful if you had posted your example in the issue text instead of as an attached file, as it explains the problem better than your text does :)

Here is a minimal reproducer:

>>> m = EmailMessage(policy=strict)
>>> m['From'] = '"Foo Bar, España" <>'
>>> bytes(m)
b'From: Foo Bar, =?utf-8?q?Espa=C3=B1a?= <>\n\n'

This serialization of the header is, as you say, invalid.  Either the comma should be encoded, or the "Foo Bar," should be in quotes.
Date User Action Args
2019-07-10 17:57:37r.david.murraysetrecipients: + r.david.murray, barry, maxking, bsiem
2019-07-10 17:57:37r.david.murraysetmessageid: <>
2019-07-10 17:57:37r.david.murraylinkissue37482 messages
2019-07-10 17:57:36r.david.murraycreate