> This document is not the place to fight spam. If you want a BCP to deprecate > the fall-back, then write one. Until all the implementations remove > fall-back to A, the correct behavior is to also fall-back to AAAA. People > (particularly the apps dev & support communities) are having a hard enough > time getting their heads around even thinking about IPv6 that making your > proposed procedural change is insane. Whatever reasons people have for not > implementing MX will not change just because they are deploying IPv6. > > The current text is just fine the way it is. I disagree. There are several good reasons for senders not falling back to AAAA lookup. I just don't happen to think that spam filtering is one of them. Keith _______________________________________________ IETF mailing list IETF@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf