MAPS (Mail Abuse Prevention System)
MAPS is a not-for-profit California organization whose mission is to defend the Internet's e-mail system from abuse by spammers. Their principal means of accomplishing this mission is by educating and encouraging ISP's to enforce strong terms and conditions prohibiting their customers from engaging in abusive e-mail practices.
"It took us 15 minutes to download and install, and any tech support
questions were often answered by you in less than 30 minutes. Thanks