I've read the Postfix documentation trying to understand what the logs are telling me, but this may still be a dumb question, so apologies in advance.
Another mail server within our own organization sends periodic messages to us, and in the logs for those emails I see this: 2025-05-30T12:52:11.432101+00:00 smtp1 postfix/cleanup[423978]: 406876023D: message-id=<> Does that mean the other system is sending me an email that lacks a Message-ID header ? If so, is that something I should tell their system administrator to fix or is Message-ID optional ? I always thought the client or first relay added a Message-ID. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
