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Postfix Documentation
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How Postfix fast ETRN works

When a Postfix delivery agent decides that mail must be delivered later, it sends the destination domain name and the queue file name to the flush(8) daemon which maintains per-destination logfiles with file names of queued mail. These logfiles are kept below $ queue_directory/flush. Per-destination logfiles are maintained only for destinations that are listed with the $ fast_flush_domains parameter and that have syntactically valid domain names.

Postfix
delivery
agent
-(domain, queue ID)-> Postfix
flush
daemon
-(queue ID)-> One logfile
per eligible
domain

When Postfix receives a request to "deliver mail for a domain now", the flush(8) daemon moves all deferred queue files that are listed for that domain to the incoming queue, and requests that the queue manager deliver them. In order to force delivery, the queue manager temporarily ignores the lists of undeliverable destinations: the volatile in-memory list of dead domains, and the list of message delivery transports specified with the defer_transports configuration parameter.

Postfix Documentation
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