[Nottingham] Tux Games Antispam - Your message is being held

[Camilo Mesias]

> You need a secure system for verifying the sender - as part of the
> transmission protocol, not as a post process - and you need an
> equivalent to the telephone preference service, which allows people to
> opt out of unsolicited phone calls.

SPF? The trouble is getting people to adopt it. And it's not without issues.

A telephone preference service won't work for email, because spammers
aren't law-abiding citizens or well regulated businesses.

-Cam