[Mimedefang] SPF

[Ernst du Plooy]

> Alas, SPF has not lived up to its promise, and it has caused some
> problems for us (we have salespeople working on the road who send mail
> through their ISP's servers.)
>
> So, so long, SPF.  Too bad you weren't useful.

Interesting.  After RBL, Graylist and Forward lookup tests I do SPF
tests.   Even after the mentioned tests I still drop around 5% of spam
due to SPF. I use authenticated SMTP to bypass SPF tests for off
campus users.

For me the above mentioned 5% makes SPF worth while.