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295508Re: Reverse DNS unknown

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  • Noel Jones
    Sep 16, 2013
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      On 9/16/2013 5:41 PM, Dave Jones wrote:
      >
      > Received: from mail02.corp.ena.net (unknown [96.4.3.90])
      > by mr11.mail.ena.net (Postfix) with ESMTP id 57C091480688
      > for <redacted@...>; Mon, 16 Sep 2013 16:04:46 -0500 (CDT)
      >
      > My forward DNS lookup for this host is an internal IP address that
      > doesn't not match the public but it has been this way for years.

      You need to do your tests as the postfix user, possibly also
      chrooted. Turn off the chroot flag in master.cf for testing.


      > I
      > didn't think the "unknown" above is dependent on FCRDNS.

      but it is. For the conditions postfix will label a host as unknown,
      please see
      http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname

      In the Received: header, the first name is the HELO name given, the
      second is either the FCRDNS or "unknown". Postfix will also log a
      warning explaining why the host is unknown.

      I don't know if the "unknown" by itself will trigger the
      SpamAssassin RDNS_NONE rule, but that seems a little strict to me.


      -- Noel Jones
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