Bit Shift (bitshift)'s status on Monday, 03-Sep-12 05:24:24 UTC
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@widget SPF is Sender Policy Framework. It's a TEXT (usually - there's one other valid type, but I don't recall it) record in DNS that basically says "these IPs are the only ones meant to be sending mail that claims to be from this domain" - if the sending machine's IP isn't on there, most of the big mail providers will just silently drop mail from it.