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Postfix: The Definitive Guide by Kyle D. Dent

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Name

default_destination_concurrency_limit

Possible values:

count

Default:

20

Postfix allows you to set a limit on the number of simultaneous deliveries to any transport in master.cf. If you don't set an explicit limit for a transport, the value in default_destination_concurrency_limit is used. Note that concurrency limits are per destination as opposed to process limits, which are per transport.

Example:

default_destination_concurrency_limit = 20

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