Yesterday, my public IP address was entered into www.spamhaus.org
as being a spammer. I have followed their advice and did a scan of my exchange server for a virus that might cause mass spamming and came up with nothing. It might be a possibility that I might be used as an open relay? Spammers might be using my server to forward their mail? Anyway, is there any instructions on how to check if my server is being used by spammers?
Thanks for the help!