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email module generates wrong MIME header with quoted-printable encoded extra space with Python 3.12.4 #120930

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@jun66j5

Description

@jun66j5

Bug report

Bug description:

In Python 3.12.4, usingEmailMessage class with long non-ASCII characters in the subject, the resulting, encoded extra space=?utf-8?q?_?= is generated. The issue doesn't occur with Python 3.12.3 and 3.11.9.

Python 3.12.4

Python 3.12.4 (main, Jun 20 2024, 23:12:11) [GCC 13.2.1 20240309] on linuxType "help", "copyright", "credits" or "license" for more information.>>>from emailimport message_from_string>>>from email.messageimport EmailMessage>>>from email.headerimport decode_header, make_header>>> msg= EmailMessage()>>> msg.set_content(u'Body text.\n',cte='quoted-printable')>>> subject='A_very'+' long'*23+' súmmäry'>>> subject'A_very long long long long long long long long long long long long long long long long long long long long long long long súmmäry'>>> msg['Subject']= subject>>>print(msg.as_string())Content-Type: text/plain; charset="utf-8"Content-Transfer-Encoding: quoted-printableMIME-Version: 1.0Subject: A_very long long long long long long long long long long long long long long long long long long long long long long long =?utf-8?q?s=C3=BAmm?= =?utf-8?q?_?==?utf-8?q?=C3=A4ry?=Body text.>>> parsed_msg= message_from_string(msg.as_string())>>> parsed_subject=str(make_header(decode_header(parsed_msg['Subject'])))>>> parsed_subject'A_very long long long long long long long long long long long long long long long long long long long long long long long súmm äry'>>> subject== parsed_subjectFalse>>>

Python 3.12.3

Python 3.12.3 (main, May 23 2024, 00:56:56) [GCC 13.2.1 20240309] on linuxType "help", "copyright", "credits" or "license" for more information.>>>from emailimport message_from_string>>>from email.messageimport EmailMessage>>>from email.headerimport decode_header, make_header>>> msg= EmailMessage()>>> msg.set_content(u'Body text.\n',cte='quoted-printable')>>> subject='A_very'+' long'*23+' súmmäry'>>> subject'A_very long long long long long long long long long long long long long long long long long long long long long long long súmmäry'>>> msg['Subject']= subject>>>print(msg.as_string())Content-Type: text/plain; charset="utf-8"Content-Transfer-Encoding: quoted-printableMIME-Version: 1.0Subject: A_very long long long long long long long long long long long long long long long long long long long long long long long =?utf-8?q?s=C3=BAmm?= =?utf-8?q?=C3=A4ry?=Body text.>>> parsed_msg= message_from_string(msg.as_string())>>> parsed_subject=str(make_header(decode_header(parsed_msg['Subject'])))>>> parsed_subject'A_very long long long long long long long long long long long long long long long long long long long long long long long súmmäry'>>> subject== parsed_subjectTrue>>>

CPython versions tested on:

3.12

Operating systems tested on:

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