Subject: Re: [spfbis] #13: RFC 4408: Best-Guess SPF

From: Arthur Thisell <[email-masked]>
Date: Wed, 29 Feb 2012 19:51:51 -0800 (PST)

I feel that any discussion of "best-guess" is out of scope.    The machinery of SPF can be fed a variety of data and it will return a variety of answers, but these are not SPF, they are extensions.   Trying to document "best-guess" or "sender-id" in RFC 4408 would be like requiring the DNS RFCs to talk about DNSBL or SPF usage of the DNS machinery.  I agree with John Levine, the proper place, if any,to discuss "best-guess" is in another RFC, or in the documentation of implementations, or a website somewhere.