We haven't had this issue since we installed Ironport C150 for blocking spam. It's been a year. Two days ago our outgoing emails started bouncing back. I checked couple of blacklists and our domain is there. I submitted removal requests but they relist us again. How can I figure out which computer is sending out junk? What could happen that all of a sudden Ironport isn't scanning outgoing emails? I checked the licenses and they're all good. What should I do in this case?
We have SBS 2008 and Exchange 2007. I used network repair wizard recently. I don't think that is the problem. I checked the send connector in Exchange Management Console. I went to Organization Configuration -> Hub Transport -> Send Connectors Tab -> Properties of Windows SBS Internet Send [Name of Our Server] -> Network Tab -> Route mail through the following smart hosts -> Our Ironport IP 192.168.1.6. There is also Address Space tab which says Specify the address space to which this connector will route email. In our case type = smtp, address = *, cost = 1. Include all subdomains checked. Scoped send connector unchecked. Should I change * to 192.168.1.6 here too?