Patrick Ben Koetter:
> 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?
Thanks for keeping an eye on this. Yes, I suppose that Postfix
should adopt such status codes (make them configurable?), but there
is no need to do this for older releases.
Wietse
