Exchange 2010 header -- messages being delayed at delivery to remote host
Posted on 2011-05-06
I've recently migrated from Ex 2003 to Ex 2010. I have two Exchange 2010 servers set up.
Server 1: EXCHANGE2010
It's been about two weeks or so since the upgrade (the Ex2003 server is gone and removed) and everything was going well.
Then, a few days ago my users started getting "Diagnostic-Code: smtp;400 4.4.7 Message delayed" for messages they sent to AOL. Then the problem started happening with Yahoo.com, then excite.com. Now it's happening to about half a dozen domains and counting.
I have tried the usual
* Reverse DNS ptr is set up correctly
* My sending transport server (EXCHANGE2010.mydomain.lcl) is not on any blacklists.
Below is an example of one of the headers that were delayed. The only thing I see here that might be a problem is that the Received: line has the Local AD domain name in it and not the actual external domain name. Could that be the problem? If so, how do I change that without having to rebuild my entire Exchange environment from scratch?
This is an emergency. Thanks for any and all help!
Received: from EXCHANGE2010.mydomain.lcl ([169.254.1.84]) by
EXCHANGE2010-2.mydomain.lcl ([169.254.2.14]) with mapi id
14.01.0270.001; Fri, 6 May 2011 14:07:56 -0400
From: My Name <email@example.com>
To: "firstname.lastname@example.org" <email@example.com>
Subject: Sending from Outlook Web App on Friday at 2pm
Thread-Topic: Sending from Outlook Web App on Friday at 2pm
Date: Fri, 6 May 2011 18:07:56 +0000