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Hah, is that all? Ok, I can explain what is probably happening.
People mailing out viruses generally don't want to be found out, or don't think that the address they are mailing from is going to make you want to open the message. There is also the problem that you can block a certain originating address pretty easily, which they want to avoid. So, they do something called "spoofing" which is basically faking the address they are sending from. The email system was not designed with a good defense against this, so it is pretty easy to do.
So, what could be happening is someone is spoofing your address and sending mails which are rejected and a response is sent back to you.
BUT, it is probably not that. I would bet that it is a harvesting tactic for spammers, much like chain letters. They mail out a bunch of these messages pretending to be a mail system admin, and when people reply to the message saying how they didn't know they were sending mail they know they have a live address.
In any case, since it is a webmail service you cannot be the source of the problem. People who host webmail are generally fairly good about keeping their systems secure, and even if they were infected there is absolutely nothing you could do about it. You don't have a bit of the server, or at least not how you are looking at it. The server could not be infected by something you were mailed, as they do not open much less execute what you recieve.
Just block the originating address on the messages and forget about it.
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