Maybe SPF should offer a BATV flag: "All Return-Paths with this domain are BATV-protected (and anything else is forged)".
or BATV could declare a syntax to include in TXT records. SPF is too old by now to add features to, but I believe (could be wrong) that it can co-exist in a TXT record with other things; if not example.net coul declare its BATV record in -batv.example.net or something although there's some BCP that gets violated when you start mandating parts of names.
_______________________________________________ Asrg mailing list Asrg at ietf.org https://www1.ietf.org/mailman/listinfo/asrg