Basically i have a cyberstalker except he is stalking a friend of mine in response to anything i do online that may provoke him.
I'd like some more details... namely - do you have any idea *why* he's stalking your friend? And why is it in response to whatever *you* do on your computer?

What is the nature of your relationship w/ this friend? I'm thinking the culprit may be a jealous ex-boyfriend that thinks something may be going on between you and this "friend"??? I know I'm jumping to conclusions, but it just seems most mysterious to me that anytime *you* do something *your friend* gets a "nasty" email...? What's up w/ that?

Anyway whatever i do he seems to detect it reasonably quickly and email horrible mails to my friend within a day - he also doesn't seem to be able to tell the content of the mails in the sense that i could write rubbish and he thinks its something else. He makes the assumption about some of the content. This again was proved when i sent a very harmless mail from my work place to home email address with 2 words in it as a test and he took the bait and used it. This proved that he somehow can read or has access to my mails coming to this machine.
[edit] A keylogger would give the attacker/stalker no way of knowing that an email had been sent from work to home[/edit]
I don't understand this at all... you sent yourself something via email... he somehow "intercepted" it, yet can't read it... and it pissed him off... wtf? What sort of "retaliation-email" came as a result? ie - what did he 'assume' the email was about...

Something's fishy here...

given the security of your box, I find it hard to believe that there's any sort of trojan, etc installed... (unless, as copyright said, it's something he wrote personally) Did you *personally* implement your systems security? Or did you have someone do it for you?

One more thing - what "authorities" were contacted? Local police dept? ISP? Who???

[EDIT] It would be most interesting if you could get one of these 'retaliation-emails' he sent your friend and post it here... I just don't understand why he'd get upset that you sent yourself something, and then say something "nasty" to your friend... Also - does he seem to be doing the same thing to your friend's system???[/EDIT]