>>SPF strict outright breaks mail forwarding, unless the forwarder rewrites the >>envelope sender.
>SPF does NOT break mail forwarding (and is not obsolete, as you claim in >later mail) Until most MTAs support SRS easily and possibly by default, SPF is going to be broken by forwarding. You are correct that it's technically not a problem with SPF but nevertheless it's a reality today on nearly all MTAs and mail platforms.
