>Does any one know of how to stop spam.

If I did, I'd be retired by now.

> I have an ip address that are using my proxy server to send out messages >once every 5 seconds.

Easy, just configure your proxy to not accept requests from that IP.

> I have the name of it but do not know how to contact them tp stop.

Ahahahaha! Yeah, like they're likely to honor that request. Just block them.