SBS 2008 + Exchange 2007
We have 3 accepted email domains on this server. One user sends out on 2 of these domains. His Exchange account is set up to use the default domain and I set him up with a dummy pop account so he can send out on the other domain. He uses this dummy pop account as his default for sending out.
It's all been working fine until 2 days ago. We are not aware of anything changing, but now Whenever he sends an email on that pop account he gets an instant bounce back from the spam filter on our mail server.
550 5.7.1 Message rejected as spam by Content Filtering.
I dont understand why our spam filter would be involved here. Shouldn't it only inspect incoming messages?