POSTFIX + DOVECOT ограничение количества писем

В документации написано:

WARNING: The purpose of this feature is to limit abuse. It must not be used to regulate legitimate mail traffic.

Вероятно Вам нужна эта настройка:

in_flow_delay (default: 1s)

Time to pause before accepting a new message, when the message arrival rate exceeds the message delivery rate. This feature is turned on by default (it's disabled on SCO UNIX due to an SCO bug).

Прописал in_flow_delay = 10s , больше не позволяет выставлять.

Письма так-же улетают одно за одним, без паузы (((

Какие еще варианты можно попробовать ?

initial_destination_concurrency parameter (default: 5)

controls how many messages are initially sent to the same destination before adapting delivery concurrency.

default_destination_concurrency_limit parameter (default: 20)

controls how many messages may be sent to the same destination simultaneously.

Еще в документации указан вариант:

/etc/postfix/main.cf:
    smtpd_client_restrictions =
        sleep 1, reject_unauth_pipelining

Выставил

initial_destination_concurrency = 1

default_destination_concurrency_limit = 1

Все равно письма ушли одно за одним....

Не помогло....

Что sleep 1, что sleep 10, письма одно за одним улетают (((

Какие еще варианты возможны ?

default_destination_rate_delay (default: 0s)

The default amount of delay that is inserted between individual deliveries to the same destination; the resulting behavior depends on the value of the corresponding per-destination recipient limit.

With a corresponding per-destination recipient limit > 1, the rate delay specifies the time between deliveries to the same domain. Different domains are delivered in parallel, subject to the process limits specified in master.cf.

With a corresponding per-destination recipient limit equal to 1, the rate delay specifies the time between deliveries to the same recipient. Different recipients are delivered in parallel, subject to the process limits specified in master.cf.

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).

Use transport_destination_rate_delay to specify a transport-specific override, where transport is the master.cf name of the message delivery transport.

т.е. в Вашем случае smtp_destination_rate_delay

initial_destination_concurrency = 1
default_destination_concurrency_limit = 1

Не рекомендуют в 1 выставлять могут быть проблемы с доставкой при ошибках.

smtp_destination_rate_delay = 600

Не помогло. Письма так-же уходят все разом. Без задержки