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267869Re: Separate Submission Instance on Same IP as MX

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  • Wietse Venema
    Aug 1, 2010
      Mike Morris:
      [ Charset ISO-8859-1 unsupported, converting... ]
      > On 08/01/2010 09:29 AM, Wietse Venema wrote:
      > > Mike Morris:
      > >> Hi,
      > >>
      > >> I'm working on a mail server deployment that will only have one server
      > >> for MX and SASL submission purposes. Generally I like to have separate
      > >> Postfix instances to handle a specific task. In this case I'm running
      > >> in to problems when the submission instance uses the same IP address as
      > >> the MX instance. (Due to a limited IP address pool there is currently
      > >> only one routable IP address assigned to this server.)
      > >>
      > >> Using the submission instance to send a message to a recipient address
      > >> for which the server is also the MX host triggers Postfix' loop
      > >> detection. Mail for foreign addresses is relayed correctly. I realize
      > >> this can be done easily enough without using multiple instances. Is
      > >> there a way to work around this so that an MX instance and submission
      > >> instance can share single IP address? I've gotten used to the queue,
      > >
      > > If you use different MTAs, then use different myhostname AND
      > > different inet_interfaces settings. Otherwise it is just too easy
      > > to screw up and have a high-speed mail system meltdown/explosion/etc.
      > >
      > > Postfix is not just about "secure" for some vague definition of
      > > secure, it is about making a safe to use, so that it does not rip
      > > off your arms and legs when you make a trivial mistake.
      > >
      > > Wietse
      > Fair enough. I'll see what can be done about a second IP address.

      Or enable the commented-out submission service (port 587) in the
      default master.cf file. With this, use port 587 for submission,
      and port 25 for final delivery.

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