> I’m moving this over from the NT Admin forum since it seems to be > purely an Exchange issue. I’m still looking for guidance on why and > what my DC is trying to send out port 25.
*sigh* You need to get example emails with complete headers from the people that are listing you (Spamhaus etc...) in order to figure out what the problem is. W/o this info we are all simply probing about in the dark. Had you posted this data, your question would likely already be answered or at the very least a very directed set of remediation steps could be given. Maybe you AV system is "helpfully" notifying all senders that they are sending viruses? Could be literally dozens of things.... Look at the "Received:" header lines to figure out what machines mail is touching. BTW, look at the headers of incoming mail to figure out the flow of inbound mail. Google for how to read email headers. There are several easy to understand guides out there. You would do well to spend the time to figure out and document (Visio is great!) your email infrastructure as troubleshooting will become much easier. ~JasonG -- ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
