Postfix

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Notes on setting up postfix.

Sane retry duration

By default, postfix will silently retry a failing mail address for 5 days.

Enable Notification of delayed mail

/etc/postfix/main.cf

delay_warning_time = 1h

Shorten total Retry Duration

/etc/postfix/main.cf

maximal_queue_lifetime = 6h
maximal_backoff_time = 15m
minimal_backoff_time = 5m
queue_run_delay = 5m