This article is from the Europe FAQ, by Yves Bellefeuille yan@storm.ca with help from Martin Rich M.G.Rich@city.ac.uk.
Send a copy of the message to the address "postmaster" at the poster's
Internet Service Provider (ISP). For example, to complain about spam
from a user at aol.com, write to <postmaster@aol.com>. Be sure to
include all the "headers". With most programs, you can simply type "h"
to see the headers; with Outlook Express, try Ctrl-F3.
For more information, see:
Fight Spam on the Internet - http://spam.abuse.net/spam/
The Net Abuse FAQ - http://www.cybernothing.org/faqs/net-abuse-faq.html
Coalition Against Unsolicited Commercial Email (CAUCE) -
http://www.cauce.org/
 
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