I have started getting a lot of "Failed delivery" notices, claiming that SPAM emails were sent from my address. These feature the correct address after the @ symbol, but a random collection of letters before it (e.g. one might claim to come from xpqstvz@Rest of my address...).
Is this a virus in my computer, or is someone else just using my email address to generate these (the address leaked out via various web pages when I was organising conferences)?
If is IS a virus, can anyone tell me its name etc. If not, is there anything I can do, short of setting up a new email address and blocking out the previous one?
(note I cannot find anything via an AVG search, and I have both AVG and Zone Alarm running to prevent Outlook Express sending messages without an OK from me).