I gotta agree with all the other comments about this.
I am getting sick fed up to the back teeth of emails telling me I'm infected, or my subscription to Norton (Or McAfee) has expired.
Realistically it's bordering on harassment.
You delete the message from your client (or let a rule do it) - Log into webmail and mark it as Spam, for Virgin to do what? Hee & Haw it appears. With my work's Exchange server, as soon as 5 people have marked an email as spam the address is blocked and all copies of the mails removed from Exchange.
We never had Spam to the levels we do now, when Google provided the service.
Phill