Originally Posted by Catlady711
It's probably a trogan or worm. The thing is it may not even be in YOUR computer. Some of those worms invade other people's computers on your email list, copy all the email addresses in it, then spam like crazy.
Another possibility is forwarded emails. Everytime you or someone you have emailed forwards it adds a long list of emails that any spammer along the line can harvest and use however they want to. That is why I never just hit forward on any email without removing all the email addresses and I'm very stern with my contacts not to do the same thing.
If any of your friends on your email list don't keep their virus protection and firewall up to date and use it, or if they don't regularly run anti-spyware programs that are updated, or forward like crazy, things like this happen.
I'd email everyone on your contact list and inform them of this, as well as change your email address. If you have contacts that just won't use proper precautions with their own computers then I'd get one of those disposable freebie email addresses for that person to email you will to protect your main email.