STOP SPAM!
Could you tell me the size of those messages with virusses/worms attached that get through? Then I can lower the maximum size of messages (messages with a larger size are than not simply bounced, but held until a list admin has looked at them and decided whether they are allowed to go through to the list).
PS: I can't see those messages myself because my university has a virus scanner on their mail servers which automatically deletes these messages.
PS2: the limit was 40kb, I've already lowered it to 25kb.
Jonas