From: Wietse Venema (wietseporcupine.org)
Date: Sun Dec 02 2007 - 16:27:17 CST

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After all the work on the Postfix queue scheduler in the past weeks,
this was the only opportunity in the forseeable future to add
support for output rate control, so I did it in a few lines, and
at the same time took the opportunity to clean up some code.

        Wietse

RELEASE_NOTES:
==============

Major changes with Postfix snapshot 20071202
============================================

Output rate control in the queue manager. For example, specify
"smtp_delivery_rate_delay = 5m", to pause five minutes between
message deliveries. More information in the postconf(5) manual
under "default_delivery_rate_delay".

postconf(5) man page:
=====================
default_delivery_rate_delay (default: 0s)
       The default amount of delay that is inserted between individual deliv-
       eries to the same destination; with per-destination recipient limit >
       1, a destination is a domain, otherwise it is a recipient.

       To enable the delay, specify a non-zero time value (an integral value
       plus an optional one-letter suffix that specifies the time unit).

       Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks).
       The default time unit is s (seconds).

       NOTE: the delay is enforced by the queue manager. The delay timer state
       does not survive "postfix reload" or "postfix stop".

       Use transport_delivery_rate_delay to specify a transport-specific over-
       ride, where transport is the master.cf name of the message delivery
       transport.

       This feature is available in Postfix 2.5 and later.

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