Comment Yes, with some reservations (Score 1) 1
We set up SPF records some time ago, and there is some value in them. However, they are not useful as a standalone pass/fail indicator of spam because using SPF in that way ends up rejecting way too much legitimate mail, and breaks legitimate forwarding. So we moved SPF out of the front line MX where the RBLs, greylisting and sanity checks live, and put it back in the 2nd layer with the spam/virus filtering, where the SPF result is examined and considered as just one factor among many.