Anti-Spam Research Group (ASRG) 
Investigates tools and techniques to mitigate the effects of spam.
Ban The Spam 
Telecommunications Research and Action Center (TRAC), the nation's oldest and largest telecommunications consumer group.
CAUBE.AU 
Fight Spam in Australia [CAUCE Partner]
CAUCE 
Coalition Against Unsolicited Commercial Email - the preeminent anti-spam group.
CAUCE India 
Stopping spam in India.
EuroCAUCE Homepage 
CAUCE partner in EU.
Freedom's Army 
Organization working to eliminate blocking of a particular netblock.
Institute for Spam and Internet Public Policy 
Providing analysis, information, and consulting on industry issues relating to public policies and processes regarding spam, email, and the Internet.
Mail Abuse Prevention System (MAPS) 
MAPS maintains the Realtime Blackhole List.
National Spam Mail Abuse Association 
Working to free inboxes of spam. Find news, tools, resources and contact information.
Spam.Anti! 
Organization that fights SPAM and offers SPAM-fighting techniques. Both in French and in English since 1996.
SpamCon Foundation 
Supports measures to reduce spam. Newsletters, mission statement, and history.
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