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Re: reject_unknown_client_hostname and 450s

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  • Noel Jones
    ... http://www.postfix.org/postconf.5.html#unknown_client_reject_code
    Message 1 of 7 , Jul 1, 2013
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      On 7/1/2013 5:05 PM, LuKreme wrote:
      >
      > On 30 Jun 2013, at 06:05 , Wietse Venema <wietse@...> wrote:
      >
      >> LuKreme:
      >>> When reject_unknown_client_hostname triggers on an NXDOMAIN it
      >>> returns a 550 error, which is great. When it triggers because there
      >>> is no PTR record, it returns a 450 error, which is also great?
      >>> except.
      >>
      >> That is incorrect. The 450 code is for errors where lookup
      >> failed (no result instead of "does not exist").
      >
      > Does not exist is NXDOMAIN, right?
      >
      > When the result is empty, like in this recent spammer:
      >
      > $ dig -x 208.84.134.170 | grep -A1 ";; Q"
      > ;; QUESTION SECTION:
      > ;170.134.84.208.in-addr.arpa. IN PTR
      >
      > postfix returns a 450. (Note, I'm not complaining about postfix's behavior)
      >
      > This IP has been failing with a 450 for weeks, but there are many.


      http://www.postfix.org/postconf.5.html#unknown_client_reject_code
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