My understanding of SPF is, you could use it as part of your spam filtering process under the following conditions... please correct me if I'm wrong:
1. You have to have the software to support it (iMail does not have the ability to check SPF records for inbound mail)
To publish an SPF record, you just need DNS, which all domains have.
To use SPF to help control spam, you do indeed need software that supports SPF (such as Declude JunkMail, the first commercial product to support SPF).
2. The rule is basically, "if the FROM address domain does NOT have an SPF record, stop the SPF checking right there and do nothing to the message. If an SPF record DOES exist, trust its contents: If the FROM domain does not line up with the list of servers authorized to send on behalf of that domain, it's safe to reject the message".
Close. There can be many different rules. For Declude JunkMail users, it is often to treat non-SPF domains as normal, "SPF-pass" domains with a lower weight, and "SPF-fail" domains with a higher weight. SPF isn't perfect -- spammers can use SPF with "+all" to indicate that anyone can send E-mail from the domain, and many domains have troubles figuring out how their users can send mail without sending it through their mailservers (causing some "SPF-fail"'s).
Someone once published a location where a "tool" was provided, making generation of SPF records "easier" by asking you all the questions and then creating the record. Can someone point me to that location again?
It's the "SPF Wizard" at spf.pobox.com (on the middle left of the screen).
-Scott
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