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Issues

• email: non-ASCII whitespace after a space is lost from address display names

  python/cpython#161678 · opened on Nov 9, 2026

• test_email: content-shadow header tuple is discarded in test_message.py

  python/cpython#161479 · opened on Nov 6, 2026

• email.header: folding a long header takes quadratic time

  python/cpython#161284 · opened on Nov 4, 2026

• email.utils.encode_rfc2231() writes 'None' as the charset when only language is given

  python/cpython#161222 · opened on Nov 2, 2026

• email: a header value that is itself a well-formed RFC 2047 encoded word is decoded or written verbatim, never encoded

  python/cpython#160148 · opened on Oct 21, 2026

• email: set_content() raises AttributeError for memoryview with 7bit, 8bit or binary CTE

  python/cpython#159858 · opened on Oct 20, 2026

• IMAP4.login_plain() does not reject NUL in a memoryview credential

  python/cpython#159631 · opened on Oct 17, 2026

• email: IndexError when folding address headers containing empty comments

  python/cpython#159621 · opened on Oct 17, 2026

• email.utils.parseaddr(strict=True) silently splices inline comments in the local-part

  python/cpython#159475 · opened on Oct 15, 2026

• Handle empty lists in strict email.utils.parseaddr

  python/cpython#159350 · opened on Oct 13, 2026
  1

• email ContentManager mutates messages after failed content validation and accepts unknown byte CTE values

  python/cpython#157254 · opened on Sep 10, 2026
  1

• Windows single-file mailbox rewrite can remove the mailbox when the fallback rename fails

  python/cpython#156699 · opened on Aug 31, 2026

• mailbox.MH.get_sequences() unnecessarily materializes large sequence ranges

  python/cpython#156379 · opened on Aug 25, 2026
  1

• mailbox.MH.__setitem__() can destroy a message when replacement fails

  python/cpython#156312 · opened on Aug 24, 2026

• Support copy.replace() for email.policy.Policy

  python/cpython#155042 · opened on Aug 1, 2026

• imaplib.Time2Internaldate raises IndexError instead of ValueError on an empty string

  python/cpython#153854 · opened on Jul 17, 2026

• email: unquoted apostrophe in a MIME parameter value is dropped under policy.default

  python/cpython#153823 · opened on Jul 17, 2026

• Email's as_bytes() method unfolds a protected header in a pgp signed message part breaking the signature.

  python/cpython#153822 · opened on Jul 16, 2026

• email: RFC 2047 encoded-word in an addr-spec local-part corrupts address parsing

  python/cpython#152519 · opened on Jun 28, 2026

• email: uncaught IndexError in the header parser on empty-input edge cases

  python/cpython#151857 · opened on Jun 21, 2026

• email.message.Message.add_header behavior differs from Message[header]=v

  python/cpython#151454 · opened on Jun 13, 2026
  15

• Email Header Parser issue t.token_type == 'attrtext'

  python/cpython#150474 · opened on May 26, 2026

• Document IMAP4.append() message type and optional arguments

  python/cpython#149962 · opened on May 17, 2026
  4

• Expose message ID list from ReferencesHeader

  python/cpython#148797 · opened on Apr 20, 2026
  5

• email.utils.collapse_rfc2231_value raises AttributeError on non-3-tuples

  python/cpython#145824 · opened on Mar 11, 2026
  3