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Re: Gmail as Relayhost

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  • Noel Jones
    ... No, fallback_relay is for when the preferred destination is unreachable. When the primary (incorrectly) rejects your mail, your options are somewhat
    Message 1 of 11 , Feb 14, 2013
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      On 2/14/2013 6:23 AM, Dominique wrote:
      > On 02/13/2013 03:24 PM, Noel Jones wrote:
      > [snip]
      > - Use some third-party relayhost service, such as dyndns. This will
      > not be free, but shouldn't cost very much. If you have more than a
      > couple dozen email addresses, this will be cheaper than a google
      > apps account.
      >
      > -- Noel Jones
      > [snip]
      >
      > I finally went with dyndns. Low cost for the volume we have and easy
      > to setup.
      > But since the price is volume based I was thinking of splitting the
      > outgoing trafficbetween my ISP and dym.com
      >
      > I thought of using relayhost to my ISP by default and use
      > fallback_relay when the ISP failed. However the documentation of
      > fallback_relay mentions only that it kicks in when then main relay
      > fails. In my case I want to use it when it bounces the mail for the
      > wrong reason (reason why I went with dyn.com in the first place):
      >
      > Feb 4 14:20:57 www postfix/smtp[6592]: 6CF7EA41F89:
      > to=<servicios@...>,
      > relay=smtp.movistar.es[213.4.149.228]:25, delay=3.4,
      > delays=0.15/0.01/0.26/3, dsn=5.2.0, status=bounced (host
      > smtp.movistar.es[213.4.149.228] said: 552 5.2.0
      > wDHP1k00B3cN3cx1hDHPt5 internal error ??. 6007 (in reply to end of
      > DATA command))
      >
      > Would it work ?

      No, fallback_relay is for when the preferred destination is
      unreachable. When the primary (incorrectly) rejects your mail, your
      options are somewhat limited.

      One ugly-hack workaround is to add soft_bounce=yes to the master.cf
      smtp transport entry, which will transform the 5xx reject into a 4xx
      retry, and hope the relay will accept the message on the next try.
      This can cause the unwanted side effect that if a message is
      persistently undeliverable it will hang around in your queue for
      $maximal_queue_lifetime (default 5 days).

      #master.cf existing smtp transport entry
      smtp unix - - n - - smtp
      -o soft_bounce=yes

      Hmmm... Now that I think about it, the soft_bounce setting should
      trigger a fallback_relay delivery attempt. Give it a whirl.


      And complain loudly to the ISP when the service you're paying for
      isn't working.



      -- Noel Jones
    • /dev/rob0
      ... snip ... It s seriously broken if it is giving 5xx rejections for its own internal errors! Granted, that might not be the actual reason for rejection -- it
      Message 2 of 11 , Feb 14, 2013
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        On Thu, Feb 14, 2013 at 08:29:06AM -0600, Noel Jones wrote:
        > On 2/14/2013 6:23 AM, Dominique wrote:
        > > Feb 4 14:20:57 www postfix/smtp[6592]: 6CF7EA41F89:
        > > to=<servicios@...>,
        > > relay=smtp.movistar.es[213.4.149.228]:25, delay=3.4,
        > > delays=0.15/0.01/0.26/3, dsn=5.2.0, status=bounced (host
        > > smtp.movistar.es[213.4.149.228] said: 552 5.2.0
        > > wDHP1k00B3cN3cx1hDHPt5 internal error ??. 6007 (in reply to
        > > end of DATA command))
        snip

        > And complain loudly to the ISP when the service you're paying
        > for isn't working.

        It's seriously broken if it is giving 5xx rejections for its own
        internal errors!

        Granted, that might not be the actual reason for rejection -- it
        could be that the internal error was encountered while retrieving
        rejection messages from a database. Still: don't pay good money for
        bad service.
        --
        http://rob0.nodns4.us/ -- system administration and consulting
        Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
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