On Tue, 10 Apr 2007, Magnus Holmgren wrote:
>
> SPF doesn't break forwarding if employed carefully. Mail isn't forwarded
> totally randomly; in sane configurations a user U tells a system A to forward
> his mail to system B. If B wants to enforce SPF, they have to allow U to tell
> them about this forwarding, so that an exception can be made.
It's unreasonable to expect users to do this.
> Otherwise they could specify the IP addresses the forwarded mail can
> come from (but that's complicated), or in many cases simply specifying
> the mail address forwarded from, letting the SPF-enforcing server make
> educated guesses, can work.
That's remarkably optimistic.
Tony.
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