Currentyly I have a Barracuda spam filter and am trying to replace it with a Sophos ES-100. We are running Exchange 2003 and a SonicWALL firewall. Email flows just fine through the Barracuda but when I disable the Barracuda and enable the ES-100 all external email is bounced back with a message "<email@domain.com>: mail for [xx.x.xxx.30]:25 loops back to myself." Outbound email flows through the ES-100 and internal email works but inbound email does not.
I've tried Sophos support and this is the reply I got back "The very first thing that you will want to do on the appliance is double-check all of the settings listed user Configuration>>Routing. You will also want to review your Additional Policies, as several of the configurable Main Actions can be used to readdress, redirect, or re-route emails." [#3208490] I looked through the Configuration>>Routing but everything is setup like our Barracuda. If anybody has any ideas what I can do to fix this problem it would be greatly appreciated.
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