gh-79986: Add parsing for References/In-Reply-To email headers (#137201)

This is a followup to 46d88a113142b26c01c95c93846a89318ba87ffc (#13397),
which added parsing for Message-ID. Similar handling is needed for the
other two identification headers.

elenril committed 3mo ago

79aa43a9797de64a3c42794f34329eab638dd67a

Parent: 4eab90f

Committed by GitHub <noreply@github.com> on 12/11/2025, 2:20:53 PM