If you have been getting spam messages that look like they have been sent by you and then returned because the other email server sees them as spam, don’t worry as much because the chances are, they are just bounceback spam. Computer World Australia has a pretty good article regarding this.

“The bounceback e-mail messages come in at a trickle, maybe one or two every hour. The subject lines are disquieting: “Cyails, Vygara nad Levytar,” “UNSOLICITED BULK EMAIL, apparently from you.”

You eye your computer screen; you’re nervous. What’s going on ? Have you been hacked? Are you some kind of zombie botnet spammer?

Nope, you’re just getting a little backscatter — bounceback messages from legitimate e-mail servers that have been fooled by the spammers. “