But a survey carried out by mail filtering firm CipherTrust has shown that spammers are the most enthusiastic users of the SPF technology.

BBC: NEWS | Technology | Spammers exploit anti-spam trap

For instance, said Mr Hogan, filtering out e-mail messages that contain a web link can stop about 75% of spam.

BBC: PC hard drive, Eyewire

Dotsafe will offer participating schools filtering technology for life, as well as personalized e-mail accounts for every student, a school Web page and the guarantee that there will be no advertising on portal pages.

CNN: Filtered ISP offers free service to schools nationwide