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The `OmitHeaders` line in `target/opendkim/opendkim.conf` ended with the
literal string `<Paste>`, a bracketed-paste escape artifact committed by
accident in 0290eca7 (2017-01-11) and carried through every edit since.
The final list entry therefore parsed as a header named
`DKIM-Signature<Paste>`, which matches nothing, so `DKIM-Signature` was
never omitted from the signed header set.
The practical impact is limited, since `RemoveOldSignatures Yes` strips an
existing signature before signing, but the file is read and copied by
users and should say what it means.
Fixes #4750
Claude-Session: https://claude.ai/code/session_01QB33XJHB14e2XjErqhcE76
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>