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Sender Policy Framework is a standard by which the owner of a domain uses a specially formed DNS record to advertise which hosts are authorized to send email for the domain.

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I have troubles understanding the default HELO checking policy of policyd-spf. RFC 4408 states in section 2.5.2, that A "Neutral" result MUST be treated exactly like the "None" result But the … man page of policyd-spf defines SPF_Not_pass as follows: SPF_Not_Pass (default) - Reject if result not Pass, None, or Temperror (alternatively put, reject if the SPF result is Fail …
asked Jul 21 '16 by bran