Originally Posted by Klen

Well, long time ago, i had similar problem - i got e-mail from hosting how my ip is spamming and how they will nullroute it. Since i was not spamming , i figured out how probably someone connected to server to proxy program which i was testing, or simply because it was windows dedicated server which is shitty operative system and full of security holes. After that i requested re install to linux and never had such problem again.