> I think that the "registration" oriented authentication mechanisms (spf, > rmx, lmap, etc.) can be useful only when the authenticator is the > hosting network provider, rather than a message author.
I think widespread use of SPF will gut the major sources of spam. The problem with spam proxies will be dimished to next to nil. Then, of course, the spammers will find other ways... But the use of domain "authentication" such as SPF will/can be a very powerful tool. Rgds, -GSH
