I set up a user from another domain (a sister company) to relay email through my local Postfix server. I added his email address to the sender_access file and it seemed to be working with several test emails we sent to local receipients and my gmail account. A few hours later, however, he sent an email to a contact and this email never arrived. The log indicates the following:
May 6 20:51:51 mail postfix/smtp: E09A9EB54D: to<email@example.com>, relay=remote.com.mail5.psmtp.com(x.x.x.x), delay=12, status=sent (250 Thanks)
To me this means that the message was handed off to the receiving server correct? Subsequent emails sent to this same person have also not been received. The domain he is sending from is not a virtual domain on the server, he is strictly using my server as a relay all I did was add his address to the sender_access file.
If the remote server was rejecting the email for some reason wouldn't there be an error message?