Kianoosh Kashefi:
> I use zimbra which uses postfix as MTA. I have configured postfix
> message rate limit to 20 mails per minute. As you may know any message
> more this qouta that will be rejected by default.
> but I need these messages to be deferred(delayed) in postfix queue,

Use a policy service such as postfwd, and configure it to reply
with the "hold" action for email that exceeds the rate limit.

ACCESS(5)                                                            ACCESS(5)

NAME
       access - Postfix SMTP server access table
        ...
       HOLD optional text...
              Place the message on the hold queue, where  it  will  sit  until
              someone  either deletes it or releases it for delivery.  Log the
              optional text if specified, otherwise log a generic message.
                ...
See http://www.postfix.org/access.5.html for more.

        Wietse

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