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send Message-ID header unconditionally #2108
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It looks like we may need an option to force IPv4/IPv6 for sending (I don't think my provider will give me an IPv6 PTR record). |
Gmail is rejecting messages without Message-ID unconditionally:
:Could not dispatch registration e-mail: 550 5.7.1 [redacted] Messages missing a valid Message-ID header are 5.7.1 not accepted. For more information, go to 5.7.1 https://support.google.com/mail/?p=RfcMessageNonCompliant and review 5.7.1 RFC 5322 specifications. y7-[redacted] - gsmtp
We send Message-ID iff DKIM is enabled. We should send it in every case.
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