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Postfix: The Definitive Guide by Kyle D. Dent

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Name

fast_flush_domains

Possible values:

hosts/domains

Default:

$relay_domains

The fast flush service allows the queue manager to retry immediate delivery of messages for a particular domain upon request. The fast_flush_domains parameter specifies a list of IP addresses, hosts, and domains that are eligible for the fast flush service.

Example:

fast_flush_domains = $relay_domains

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