Any server admins out there ? I am running a fairly locally popular server, and since christmasday I've seen a bunch of "undeliverable" e-mails with spam, supposedly send from a user on the server, but the IP address isn't my server. what to do ? I kind of fear my domain will get a bad reputation from sending spam, but as I can see they aren't sent from the server. looks a bit like a zombie bot net, since they reduced in amounts on christmas day and picked up again around 27th-29th (when people are once again back at their infected computers) they all carry similar content, but different sent from e-mails and IP addresses.