Am 07.02.2023 um 15:02 schrieb Larry DrFranken Bolhuis <midrange@xxxxxxxxxxxx>:
Message that is coming back from gmail and other hosted email at google is
"550-5.7.1 x.x.x.x Messages missing a valid messageId
The very odd part is that even without this PTF, some systems don't see the error. Seems (no proof) that if you're still routing through MSF then the problem doesn't occur.
Interesting! This at least shades some light onto that "does not work" issue.
But if sending directly through SMTP (clearly preferred) then it fails.
Even if that "direct send" provides a (proper) message-id header?
MSF seems to behave correctly that when no message-id is supplied, it adds one.
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