"Aredridel" <aredridel(_at_)nbtsc(_dot_)org>>
Computationally, as opposed to network load, SPF checking is pretty
easy. The libspf-alt package can handle an absolutely amazing number of
queries per second, and even the perl module can do quite a bit.
Yes, but if this is load borne by the recipient to service the publisher
...
It's not the cost (as such) that I would have a problem with - it's the
cost-shifting.