So, a random remote email sender is trying to send one of my users an email. Each time the remote sender's message is bounced back. The full text of the error message is as follows:
Reporting-MTA: dns; TMPMX1.REMOTEDOMAIN.COM
Arrival-Date: Mon, 30 Oct 2006 15:48:18 -0500 (EST)
Final-Recipient: rfc822; firstname.lastname@example.org
Diagnostic-Code: X-Postfix; host mail.domain.com[XXX.XXX.XX.XX] said: 550 5.7.1 Requested action not taken: message refused
Looks like the remote mail server is Postfix. The local mailserver, that I manage, is an Exchange 2003 server.
I can send this remote sender a direct message with no problem. The remote sender can reply to a message from me or others in the domain with no problem.
DNS reports check out for their email server and our Exchange server. Neither is listed on any RBLs.
Anyone have any ideas?
Your help would be appreciated.