On 11/30/2015 2:51 PM, Ted Lemon wrote: > Why would I be relaying mail on? Only for a mailing list. For the mailing > list, what I want SPF to validate is that the mail came from the mailing > list.
That's a common misconception. It leaves out a variety of other, valid scenarios. The most obvious is mailbox aliasing, such as for vanity addresses such as university alumni associations provide. Email is store and forward, and this can and does mean transit across /multiple/ independent administrative domains. The fact that the vast majority of mail goes directly (one hop) from origin AD to the recipient's AD does not mean it is reasonable for anyone to make systemic design decisions that constrain that fundamental flexibility. IMO an essential design benefit in many/most aspects of Internet technologies is avoiding making any more global assumptions (or requirements) than essential. "Deferring to the end systems" is a very broad-based design requirement and it includes minimizing assumptions about the transit infrastructure. d/ -- Dave Crocker Brandenburg InternetWorking bbiw.net _______________________________________________ Shutup mailing list [email protected] https://www.ietf.org/mailman/listinfo/shutup
