Sender Policy Framework (SPF)

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wikipedia:Sender Policy Framework (2014)

+ for a PASS result. This can be omitted; e.g., +mx is the same as mx.
? for a NEUTRAL result interpreted like NONE (no policy).
~ (tilde) for SOFTFAIL, a debugging aid between NEUTRAL and FAIL. Typically, messages that return a SOFTFAIL are accepted but tagged.
- (minus) for FAIL, the mail should be rejected (see below).


v=spf1 -all


See also[edit]