I'm running exchange 2010 here with all the service packs. I think that I
must have misconfigured one of my receive connectors. I know I am not an
open relay from the outside, but I think I have a machine inside my network
that is compromised and using exchange to send out since I have many
messages sitting in my queue that are undeliverable. Any suggestions as to
how I'd determine from which IP these messages are originating? The sender
always looks like <> I've opened up the message tracking logs, but can't
find any incriminating evidence there.
