gh-108280: Give a meaningful error for an invalid imaplib greeting#152768
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serhiy-storchaka merged 1 commit intoJul 2, 2026
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Connecting to a server that does not send a valid IMAP4 greeting, such as a POP3 server answering on the IMAP port, failed with the unhelpful "imaplib.IMAP4.error: None". A meaningful message is now raised instead. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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serhiy-storchaka
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needs backport to 3.13
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15. |
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GH-152856 is a backport of this pull request to the 3.15 branch. |
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needs backport to 3.15
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GH-152857 is a backport of this pull request to the 3.14 branch. |
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GH-152858 is a backport of this pull request to the 3.13 branch. |
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…ting (GH-152768) (GH-152858) Connecting to a server that does not send a valid IMAP4 greeting, such as a POP3 server answering on the IMAP port, failed with the unhelpful "imaplib.IMAP4.error: None". A meaningful message is now raised instead. (cherry picked from commit 262b6a0) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…ting (GH-152768) (GH-152857) Connecting to a server that does not send a valid IMAP4 greeting, such as a POP3 server answering on the IMAP port, failed with the unhelpful "imaplib.IMAP4.error: None". A meaningful message is now raised instead. (cherry picked from commit 262b6a0) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…ting (GH-152768) (GH-152856) Connecting to a server that does not send a valid IMAP4 greeting, such as a POP3 server answering on the IMAP port, failed with the unhelpful "imaplib.IMAP4.error: None". A meaningful message is now raised instead. (cherry picked from commit 262b6a0) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Connecting
imaplibto a server that does not send a valid IMAP4 greeting-- for example a POP3 server answering on the IMAP port -- failed with the
unhelpful
imaplib.IMAP4.error: None.A
+OK ...greeting matches the continuation response pattern, so_get_response()returnsNoneandself.welcomeis left asNone. Theerror now reports the greeting the server actually sent, e.g.
invalid greeting: +OK POP3 server ready, so it is clear the peer is not anIMAP server. An untagged greeting such as
* BYE ...is reported likewise,and a bare continuation with no text yields
invalid greeting from server.imaplib.IMAP4.error: None#108280