Recenty I've had two Emails into my inbox that confused me. The first one says the I sent an Email to someone which contained a virus and ended with "if you did not send the Email please ignore this communication" and yesterday one tells me that an Email I did not send has not been delivered and asks me to get respond so the problem can be resolved.

Has my email address being cloned or stolen or is this just another fishing exercise by spammers?

I am using Outlook 2003 on XP if that helps/make a difference.

Any advice would be appreciated