Client has SBS 2003, using DNS not a Smart Host. Someone with a hotmail email account got the message below when trying to send to them. My client has Trend Micro hosted email filtering and this email did not show in that log, it wasn't blocked by TM, it never got there. The person sent the email again a few minutes later and it did go thru as well as a couple of others. The ndr message seems to be coming from Hotmail. The email was sent to two people, both bounced. I've done some searching but haven't really found, plenty if the email was sent from the Exchange server. Any idea what would cause this?
Date: August 28, 2012 9:11:39 AM PDT
Subject: Delivery Status Notification (Failure)
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
Reporting-MTA: dns;blu0-omc4-s14.blu0.hotmail.com Received-From-MTA: dns;BLU401-EAS17 Arrival-Date: Tue, 28 Aug 2012 09:11:31 -0700 Final-Recipient: rfc822;firstname.lastname@example.org Action: failed Status: 5.5.0 Diagnostic-Code: smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)