Jan Ingvoldstad writes:
Adding support for a new, optional record type is always a hassle. Supporting the TXT record that SPF was designed for in the first place is easy, no changes are needed.Also, the rationale for having a SPF record type was very weak in itself. When it was proposed, I had the same thoughts about adding it as you have about removing it: there was no sane reason for it. Even worse, there was no sane reason for adding and using SPF, it would only add hassle, and not do what the proponents claimed it would to – which turned out to be right; e- mail and DNS admins everywhere have to contend with SPF-based peculiarities.So, IMNSHO, SPF should die. Completely.--
Originally I had the same reaction. I wasn't really excited about implementing it, but it did have some potential value in it. But back then, return address forgeries were quite common, and algorithmic spam filtering wasn't quite as advanced as it is now. With a fairly wide adoption of SPF on the inbound side, a domain could see noticable value in publishing SPF records, because it blocks a fairly good amount of spam forging their return address, notwithstanding the known SPF issues with forwarding and mailing lists.
I only have Gmail's algorithmic spam filters to go by, but if they're taken as representative of average effectiveness of a typical, large, mail provider – their fairly good, and domain forgeries are probably less of a factor now, since most people don't notice much spam any more. Most of the impact is probably just backscatter, and backscatter sources tend to mailbomb themselves out of existence, and/or blacklisted into a void, fairly quickly, so it's a self-addressing problem.
So, I guess I'm saying that SPF isn't really as useful as it was before, but, I'm not going to take my SPF records out, until they're completely useless.
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