Comment Re:Isn't this what we want? (Score 3, Insightful) 249
You are partially correct. It does marginally increase the cost of doing business for spammers, but remember that the major spam houses have the capital to lease major bandwidth, and have for some time. Having to madly swap domains to get is only going to swamp smaller spammers with enough extra cost to kill them. The big boys are going to keep chugging along, and the big boys are the biggest source of spam (obviously).
What I like about SPF is that as larger ISPs adopt it, I can stop worrying about accidently filtering their domains just because of the domain name on the From: header. I'm fully aware I'm still going to have to filter, but it's nice to know that "tightvagina@yahoo.com" actually came from an authorized Yahoo mail server. Combine that with any number of of rational filtering schemes, and you have a much lower false positive rate, with the bonus being that you didn't have to take the whole message from a sender who fails the SPF check.
