Posted By
Josh Boiselle
07-25-2023 02:08:52 PM
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FWIW, the message identifier, for better or worse, is technically listed as optional in RFC 2822. 3.6.4. Identification fields Though optional, every message SHOULD have a "Message-ID:" field. Furthermore, reply messages SHOULD have "In-Reply-To:" and "References:" fields as appropriate, as described ...
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