This is a list of individuals and organizations noteworthy for engaging in bulk electronic spamming, either on their own behalf or on behalf of others. It is not a list of all spammers, only those whose actions have attracted substantial independent attention.
This is an incomplete list which may never be able to satisfy particular standards for completeness. You can help by expanding it with entries that are reliably sourced.
Shane Atkinson, who was named in an interview by The New Zealand Herald as the man behind an operation sending out 100 million emails per day in 2003, who claimed (and appeared) to honor unsubscribe requests, and who claimed to be giving up spamming shortly after the interview. His brother Lance was ordered to pay $2 million to U.S. authorities.
Canter & Siegel, a husband and wife who famously posted one of the first commercial Usenet spam advertisements to thousands of newsgroups and were defiant in the face of thousands of email flames, having supposedly generated over $100,000 in revenue from the ad.
Richard Colbert, a retired spammer (as of 2003) who scoured AOL for business contacts, offering spam as his service, claims to have honored "unsubscribe" requests, and gave an interview to The New York Times.
Jumpstart Technologies, an incubator of prominent social networkHi5 and the first entity to pay a settlement as great as $900,000 for violating the CAN-SPAM act, later spun off into social networking site Tagged, which subsequently paid upwards of $1.5 million in various fines and legal settlements involving government entities as well as private individuals, and was referred to by Time magazine as "the world's most annoying website."
Ryan Pitylak, known as the “Texas Spam King”, admitted to sending 25 million emails every day at the height of his spamming operation in 2004.
Alan Ralsky, Scott Bradley, John Bown, William Neil, and James Fite, who pleaded guilty to conspiring to use spam emails to pump and dump thinly traded stocks, in violation of the CAN-SPAM Act. The group faced years of prison time and millions of dollars in penalties under the terms of their plea agreements.
Dave Rhodes, the (possibly apocryphal) name attached to a famous chain letter titled "MAKE MONEY FAST" that originated in the late 1980s.
Scott Richter, who paid $7 million to Microsoft in 2006 in a settlement arising out of a lawsuit alleging illegal spam activities.
Christopher "Rizler" Smith, who was forced to pay $5.5 million to America Online for spam activity in 2003 and is currently serving a 30 year prison sentence for charges not related to spam.
Jody Michael Smith, a spammer and director of the world's largest online replica watch network. Shut down by the FBI and FTC in October 2008. Smith served 11 months in federal prison and forfeited over $800,000 in assets.
Robert Alan Soloway, who lost a $7 million civil judgment against Microsoft and was forced to pay $10 million to a small ISP in Oklahoma.
Sanford Wallace, who was fined $4 million under the CAN-SPAM Act in 2006, lost a $230 million judgment to MySpace in May 2008, and was ordered to pay $711 million in damages to Facebook in 2009 for accessing users' accounts without their permission and sending phony posts and messages.