Thousands of "Undelivered Mail Returned to Sender" messages everyday from mail I did not send!
Posted on 2008-09-29
I'm running Exchange 2003 on W2k3 server. Lately, I'm getting literally thousands of returned mail messages daily as if someone is sending mail from my domain to huge lists and I'm getting all of the returned mail. Is there anyway to tell whats going on here?
I started digging around in my Exchange System Manager and found a bunch of unknown domain names in my outbound SMTP connections. I frooze all of them besides my domains. How can I stop this?!?!