Originally posted by BigBison
Like it or not, SPF is part of 'Sender ID' now
Actually, as with so many other things, MS tried to "absorb" SPF into Sender ID. That doesn't mean the industry will adopt Sender ID. In fact Sender ID has been fairly soundly rejected by several important groups.
The IETF task force on this, MARID, recently dispanded without proposing a standard. At this point, SPF is still the closest thing to an accepted standard. Whether SPF will be widely adopted remains to be seen, but SPF and Sender ID are still very distinct, despite whatever MS may say. SPF has much better chances of industry acceptance than SenderID did, largely because of MS's licensing blunders.