hey guys, along with the usual mortgage and viagra ads in e-mail, I recently noticed my spam mail is loaded with mail in a variety of forms talking about failed deliveries, full mail box (i only use outlook), delivery status notification(failure), info@ hotmail and msn password update-I don't use hotmail or msn, your mail is blocked from postmaster@yahoo and the list goes on. They all have a zip file attached which is empty. I have scanned my PC with my E-trust and online, ran spybot and adaware all with nothing found.

Is this something i should be concerned with or just let it pass?