I get a lot of E-mail that would fail SPF that is in fact valid. A lot of mail scripts and E-commerce sites are set up to send E-mail notifications with the Mail From generated from a user submission (since one can just simply press reply in order to respond).
Also, some of my own customers are blocked by their ISP's from using my mail server for SMTP, which means that if I configured SPF strictly for their domains, they would fail this test wherever implemented.
If you opt to use SPF on your system, take advantage of the weighting capabilities of Declude, and I would suggest at most being very cautious about how much weight you give it.
Matt
Lyndon Eaton wrote:
That's a real shame! If you received a negative response from an SPF
participating domain, you should be able to reject the message straight
off. That way you aren't left 'carrying the can' so to speak, and the
email gets stuck with the HiJacked server or the spammer. Similar to how
AOL reject connected if the rev DNS lookup fails.
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