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.
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