RE: Is my e-mail address being used to send spam?

Like David says, it probably isn't YOUR PC sending the spam, it's someone else 
forging your email address in the <from> field.  I've been getting spam from 
myself lately via this very route.  

Additionally, I've made occasional postings to several mcpressonline forums and 
someone has picked the email addresses out of them.  So now, spammers are 
sending 'get big lips now!' adverts using that email address as the return 
address.  Well, some people aren't keen on larger lips apparently and complain 
to their administrator, who then sends me an email telling me to stop.

Basically, it means that I have to train SpamBayes to ignore these admin 
posts...  Like David says, you can pretty much ignore this email unless you 
have a zombie'd Windows PC.  Any modern antivirus software along with Windows 
Update and some spyware detectors like Ad Aware and Spybot should be able to 
verify that you yourself don't have a virus (and therefore are sending out spam 
at someone else's behest.)

Good luck!
  --buck