Alright. It's now happened again. I can't send any more e-mails out for another 24 hours because I've reached my daily limit of 1000. In other words, people have been using my server again to keep spamming. I removed all contact forms from my pages that allow users to e-mail me. I don't know how else to stop this other than just turning off the SMTP server, but if I do that then my e-mail doesn't work and my primary e-mail address is used on this server.
I'm willing to let one of the "known" people of ISPConfig SSH and look at my computer to see what may be wrong if you would be willing to do so. Like I've said in other posts, all of the relay testing sites say they can't relay from my server so something is up. I don't know what else to do here. Please help.