Author: R.Odom (20 Oct 07 2:33pm)
Just tried to send a referral from http://www.projecthoneypot.org/refer_a_friend.php but got a bounce due to SPF. My domain's SPF record specifies IPs which may send e-mail for it, and has "-all" to disallow any others.
Because the "refer a friend" sets my address as the "From:" address, but it isn't sent from one of my servers, any site that does SPF checking should bounce it.
Adding a "Sender:" to be a projecthoneypot.org address will probably cure this.