Stopping Spam With Linux - page 3
IntroductionFret not! If your best efforts to block spam at the receiving end fail, Linux can still help you!
whoisTo complain back to the source of the mail you can look up the people that run the spam site with the whois command. Just use the left hand side of the address as input.
mordell:~% whois cyberpants.com
x-Cyber Promotions (Cyberpants5-DOM)
8001 Castor Avenue Suite 127
Philadelphia, PA 19152
Domain Name: Cyberpants.COM