On 15.10.16 17:33, Petr Bena wrote: > I started this discussion stating the fact that SPF, DKIM and DMARC > don't prevent people from being able to spoof your email address.
These mechanisms are not meant to prevent spoofing (and they can't), just to make it easier to detect spoofing on the receiving end. If the receiver does not bother checking, decides against checking, or simply is incapable of checking, the sender can jump through all sorts of hoops and it won't help. And it might all fall to pieces anyway, based on what the MUA displays. I'm not sure I understand what type of discussion you hope to nurture by stating that A does not prevent B when A was not designed to prevent B. -Ralph
