Exchange server 2003 SP2
We are having an issue with email sent to one domain repeating. All emails from our exchange server (@domainabc) are routed through third party spam filter server before sending to recipients. There are no issues with all other recipients only recipeints@domainxyz. They are reporting having no issues with anyone other than us.
Mail tracking on our exchange server show emails to @domainxyz as having been sent to the spam filter server. The requested delivery report for email to recipient@domainxyz states, "Action: failed Status: 4.4.2 Diagnostic-Code: X-Postfix; conversation with @domainxyz [xxx.xxx.xxx.xxx] timed out while sending message body."
DNR was forwarded to me as well as recipeint@domainxyz from sender@domainabc. Recipeint's email continued to repeat. I created policy on spam filter to keep from sending repeatedly to recipient @domainxyz. However, a more permanent solution is required. Is this event occurring on our end or theirs?
I have sent all relevant information to support at the spam filter server as well and am awaiting a response from them.