It's very possible whoever is sending you the viruses doesn't know it's happening. It may not even be coming from who you think it's coming from.
There are viruses out there that will take over an email client, and mail themselves out. Some of these viruses will also get names from the address book of a user, and mimic that address as the sender.
I saw this posted on Diabloii.net just a few days ago:
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Not D2, but lately we are getting a tremendous amount (dozens a day) of email viruses to all @diabloii.net addresses. The most common one is W32.Klez.E@mm and note how it works; by redistributing itself by changing your outgoing mail name to a sender of a mail in your inbox. So hundreds of people are getting emails that appear to be from flux, gaile, elly or Rush here, but aren't from us, they are the virus on someone else's machine, picking our names from a reply mail in that person's inbox. I got 4 virus mails this morning with myself as the return address, and I don't even use OE (3 guesses why not). You need to look at the "Return Path" in the email header, to see where a mail really comes from, since it's child's play (or virus' play) to spoof someone else's name in the "Reply To" line. There's a Yahoo news item about this today, but we've been getting a dozen or more a piece every day for weeks. As with virtually every virus but measels, this one spreads wildly through security holes in Outlook Express. If you are using MSOE for your mail client and you haven't patched the latest security problems with it, you are guaranteed to be a virus victim, sooner or later.
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