Hi,
Thanks for reading. The company mail server is sending out lots of spam. The spam is going out to random addresses and not ones on our global address list. Initially I thought it was internal PC or server that is infected and we made sure all PC and servers are clean. With spam still getting sent out I used WireShark. After running a short capture I found out that external servers/machines are using our mail server to forward on spam. All the spam emails that come through have a blank From address. Not sure how to tackle this. Here is some info on our setup -
We are using Exchange 2007 SP1 on Windows 2008 SP1. We have a spam filter (SPAMFighter) running which is applied to all mailboxes (not distribution groups or contacts). The spam filter does its job really well and we barely ever get a spam email in our mailboxes. All our emails...
