Warning!

[Mobhack]

Many 'hacks' exploit the infected computers contacts list to send spam and worse. He may not even realise it (yet) - until folks start complaining to him!.

It's been around for ages - had someone use my old CostUServe account in the mid-late 90's when they were still 1234567(@)compuserve.com or suchlike format so dirt simple for spammers to pose as you.