> For your domain to publish SPF support, so that others using SPF can know > what IPs are allowed to send mail from your domain, all you need is DNS. > > For you to block mail that fails SPF, though, you need an > anti-spam program (such as Declude JunkMail) that supports SPF.
I see no where on http://spf.pobox.com/faq.html that states SPF requires an anti-spam program.
That's not relevant, actually -- they just assume that you are running anti-spam software (just as Spamcop likely assumes that you are running anti-spam software if you want to use their service). You can't use an Internet protocol without running software that supports it.
My original post was for the folks at IPSwitch asking them if there was any chance of adding code to support Sender Policy Framework (SPF) - nothing more.
And my response was designed to explain why it isn't likely to happen. :)
FWIW, the support for SPF takes about 100 times the amount of code as some other (just as effective) spam tests. Perhaps that works better than my 'SPF support is complex' comment. :)
-Scott
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