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Postfix Documentation
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Tuning the number of recipients per delivery

The default_destination_recipient_limit parameter (default: 50) controls how many recipients a Postfix delivery agent will send with each copy of an email message. You can override this setting for specific Postfix delivery agents. For example, "uucp_destination_recipient_limit = 100" would limit the number of recipients per UUCP delivery to 100.

If an email message exceeds the recipient limit for some destination, the Postfix queue manager breaks up the list of recipients into smaller lists. Postfix will attempt to send multiple copies of the message in parallel.

IMPORTANT: Be careful when increasing the recipient limit per message delivery; some smtpd(8) servers abort the connection when they run out of memory or when a hard recipient limit is reached, so that the message will never be delivered.

The smtpd_recipient_limit parameter (default: 1000) controls how many recipients the Postfix smtpd(8) server will take per delivery. The default limit is more than any reasonable SMTP client would send. The limit exists to protect the local mail system against a run-away client.

Postfix Documentation
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