Wandering Thoughts archives

An Internet rule of thumb

Any Internet protocol change that requires everyone's participation is dead on arrival.

This often applies to would-be antispam efforts such as SPF.

(Superficially, SPF looks like it is an isolated thing that only involves the sender having SPF records and the receiver checking them. It's not, and the way it requires everyone's participation is illustrated by the need for the Sender Rewriting Scheme.)