I am having problems with my Exchange Server blocking emails from hotmail.com.
We are using Small Business Server 2003. About 5 days ago, all email coming into our acdata.com domain started getting blocked. The server also accepts mailsfrom acdatainc.com and acdatasystems.com. These two work just fine, only acdata.com is blocked.
Our mail setup is as follows. A Barracuda firewall, hosted offsite, answers all incoming mail, then it forwards to my mail server, also hosted, each mail box has a forwarder setup that sends to my exchange server. It sends via portal.acdatasystems.com, another one my server answers to.
Here is the hotmail error message:
This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed. firstname.lastname@example.org
--Forwarded Message Attachment--
Date: Tue, 27 Nov 2007 11:03:31 -0700
Here is the contents of the details attachements that comes with the undeliverable message:
Arrival-Date: Tue, 27 Nov 2007 10:03:31 -0800
Diagnostic-Code: smtp;554 Transaction Failed (650058837:169:-2147467259)