I think I finally managed to get filters set up to send 99% of those damned virus messages straight to the trash can. I just can’t convince Norton Antivirus that no, I really DON’T need to know every time it stops a copy. Just delete it silently and go on, okay? But apparently, there’s no way to do that, because Symantec wants me to KNOW that it was worth my money.
Edit: Every copy of the virus I’ve received so far has a header referencing “Maillennium” so that’s been the most reliable way to filter them out. Of course, it changed after I said that. Dammit. But on the good side, I did find the way to have NAV stop bugging me every time it stops a copy of the virus.