Reverse DNS Failure Code

Wed, 17 Sep 2014 02:01:20 -0700 

There's an RFC for "Email Authentication Status Codes"
<https://www.rfc-editor.org/rfc/rfc7372.txt> out, which specifies a dedicated
status code "when an SMTP client's IP address failed a reverse DNS validation
check, contrary to local policy requirements" (see: 3.3.  Reverse DNS Failure
Code):

3.3.  Reverse DNS Failure Code

      Code:               X.7.25
      Sample Text:        Reverse DNS validation failed
      Associated basic status code:  550
      Description:        This status code is returned when an SMTP
                          client's IP address failed a reverse DNS
                          validation check, contrary to local policy
                          requirements.
      Reference:          [RFC7372]; Section 3 of [RFC7001]
      Submitter:          M. Kucherawy
      Change controller:  IESG

Should Postfix send that code when reject_unknown_reverse_client_hostname is
in place?

p@rick


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