On Mon, Sep 06, 2004 at 07:30:31PM -0000,
John Levine <johnl@xxxxxxxx> wrote a message of 74 lines which said:
My proposal is to use this scheme to determine the address to check,
Nice idea but, as discussions on this group showed, there is little hope to have a consensus on this algorithm. Hence the "unified SPF" (http://spf.pobox.com/unified/) idea which disconnects the protocol and the DNS RR from the choice of the domain used for the validation. "Unified SPF" gives you several choices for this domain and your (fetchmail's) algorithm could be one of them.