Hi, all.
Exchange 2013 with CAS server and 2 mailbox servers. Health checks are all 100% healthy.
One of our users cannot receive email from an external user. Our CAS server keeps rejecting the message. I can trace the message and see that it did indeed hit our servers, and was rejected. But I cannot find out WHY it was rejected.
Here is the Delivery Report from the EAC:
Delivery Report for NAME (user@ourcompany.com)Failed
3/30/2015 1:41 PM <CAS servername>
The message couldn't be delivered.
[{LRT=};{LED=500 Message rejected};{FQDN=};{IP=}]
The external user gets this NDR:
<our local CAS servername> gave this error:
Message rejected
In the Diagnostic information for administrator section:
<our local CAS servername> returned '500 message rejected'
followed by the Original message headers. I think I'm looking for some more verbose logging to see what rule or configuration rejected the message. Any help would be greatly appreciated!
Thanks!
Dan