Ray wrote:
Alice (al...@example.com) sends Bob an Email (b...@myserver.com) CC (b...@3rdserver.com) I run myserver.com. message goes through to b...@3rdserver.com, but not b...@myserver.com.
there is absolutely no trace of alice's domain in the mail logs.

Do you have "smtpd_delay_reject = yes" set in main.cf? If not, searching for Alice's domain might not help. In that case, you'd need to search for her outgoing mail server's IP address in your logs to see why it is unable to connect to your server. Note that it may not be easy (read: possible) to determine that IP address without assistance.

If either,

a) you have set smtpd_delay_reject = yes
b) you don't, but can't find her outgoing server IP in the logs, either

then the message is never making it to Postfix. Regardless, the easiest and most straight-forward way to solve this is for Alice's mail admin to find out where her message went. Even if it's ultimately your fault, he or she has a better view of the problem.

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