John Levine wrote: > change the record format so it won't be confused with > Sender-ID Confusing strings "v=spf1" and "spf2.0" is not impossible, but difficult enough, no change needed. > you can tell what the results of your experiments are Only if you strictly use different local parts in PRA and MAIL FROM, otherwise you can't be sure what the other side actually tried to check. Example with a fresh snapshot: <http://article.gmane.org/gmane.mail.spam.spf.discuss/19908> > "We want to do experiements but those Sender-ID meanies > won't let us" doesn't fly. I'm not interested to experiment with PRA for my mail, let alone with mails of others. It's no rocket science to tell precisely where, when, and why this cannot work. If you're looking for the next guy saying "whatever you do, give it to ITU or to anybody, but not to the IETF", then you've found him. I despise "opt out" schemes. Bye, Frank _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf