"This is just a notice, it is not a virus!"
This must be the most stupid outgoing anti-virus filter software feature I have seen so far: Instead of a virus, the "intended" recipient gets a notification that someone tried to send a virus to them, but that this virus was caught by a filtering service. Basically, this replaces outgoing viruses by outgoing spam.
A close second (and long-time favorite) is e-mail scanning software that adds "certified virus-free" notices to outgoing messages. These notices are, of course, about as trustworthy as the words "I love you" in an e-mail's subject line.
