gh-49680: Add translate_line_endings parameter to imaplib.IMAP4.append#152775
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serhiy-storchaka merged 3 commits intoJul 2, 2026
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Pass False to send the message as an exact sequence of octets, without rewriting bare CR or LF to CRLF. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Documentation build overview
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Read the APPEND literal by its octet count and verify that a serialized email message with bare LF is sent verbatim when translate_line_endings is false. Document using email.policy.SMTP for that case. Co-authored-by: harjoth <harjoth.khara@gmail.com> Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…slate-newlines # Conflicts: # Lib/test/test_imaplib.py
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IMAP4.append()rewrote every bare CR or LF in the message to CRLF(
MapCRLF.sub(CRLF, message)) before sending it as the APPEND literal.But an IMAP literal is "a sequence of octets (including CR and LF)"
(:rfc:
3501), and the protocol framing -- the octet count and thetrailing CRLF -- is handled separately by
_command(), so rewriting thepayload silently corrupts the caller's message (for example, content with
intentional bare CR or LF, reported back in 2009).
This adds a keyword-only
translate_line_endingsparameter. It defaultsto
True, preserving the previous behavior; passingFalsesends themessage literal exactly as given.
smtplibis intentionally left unchanged: it transmits the message asCRLF-terminated lines in the
DATAcommand (:rfc:5321), wherenormalization is required for correct framing -- unlike an octet-counted
IMAP literal.