Notable cases include actions taken against UUNET, CompuServe, Excite@Home, and Google Groups.
UDPs have been issued against America Online, BBN Planet, CompuServe, Erols Internet, Netcom, TIAC,[1] and UUNET.
Executives called the UDP "digital terrorism", threatened legal action,[6] and asserted they had been planning to move against spammers anyway.
[7] As the volume of spam from UUNET decreased, the organizers called off the penalty on August 6,[8] though their announcement was stifled by cancel messages from UDP opponents.
[10] A UDP scheduled to begin against Excite@Home on 19 January 2000[11] was lifted the day before it was scheduled to begin after the ISP began scanning for the misconfigured proxy servers on home users' computers which it blamed for spam originating from its network.