Section 3 "SPF Record Evaluation" contains:
| Fail (-): the message does not meet a domain's definition of
| legitimacy. MTAs MAY reject the message using a permanent
| failure reply code. (Code 550 is RECOMMENDED. See RFC2821
| section 7.1.)
I would think that 571 be more appropriate code to recommend than 550.
From RFC3463:
| X.7.1 Delivery not authorized, message refused
|
| The sender is not authorized to send to the destination. This
| can be the result of per-host or per-recipient filtering. This
| memo does not discuss the merits of any such filtering, but
| provides a mechanism to report such. This is useful only as a
| permanent error.
--
Mark Shewmaker
mark(_at_)primefactor(_dot_)com
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