From: Wietse Venema (wietseporcupine.org)
Date: Wed Jun 03 2009 - 10:00:32 CDT

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Calvin Browne:
> Hi all - need someone to hit me with a clue bat.
>
> I have one particular address in a domain that is handled by
> virtual_alias_domains through a virtual_alias_maps table. This address
> gets redirected to an account on another smtp server. I would like to
> rate limit the delivery perhaps by sending it over its own transport?
>
> Any clues/pointers appreciated.
> mail_version = 2.2.10

A workaround for Postfix < 2.5 is in
http://www.postfix.org/QSHAPE_README.html#backlog:

    * In the transport map entry for the problem destination,
      specify a dead host as the primary nexthop.

    * In the master.cf entry for the transport specify the problem
      destination as the fallback_relay and specify a small
      smtp_connect_timeout value.

      /etc/postfix/main.cf:
          transport_maps = hash:/etc/postfix/transport

      /etc/postfix/transport:
          example.com slow:[dead.host]

      /etc/postfix/master.cf:
          # service type private unpriv chroot wakeup maxproc command
          slow unix - - n - 1 smtp
              -o fallback_relay=problem.example.com
              -o smtp_connect_timeout=10
              -o smtp_connection_cache_on_demand=no

With recent Postfix versions, use a transport map and
the _destination_rate_delay feature.

/etc/postfix/main.cf:
    transport_maps = hash:/etc/postfix/transport
    slow_destination_rate_delay = 10

/etc/postfix/transport:
    userexample.com slow:

        Wietse

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