Mar 182016
 

postfix“… Use a fallback_relay host for mail that cannot be delivered upon the first attempt. This “graveyard” machine can use shorter retry times for difficult to reach destinations. See “Tuning the frequency of deferred mail delivery attempts” … ”

“… When mail is being deferred frequently, fixing the problem is always better than increasing the frequency of delivery attempts. However, if you can control only the delivery attempt frequency, consider using a dedicated fallback_relay “graveyard” machine for bad destinations, so that these destinations do not ruin the performance of normal mail deliveries. …”

Postfix relayhost MTA / Public IP – e.g.

maximal_queue_lifetime = 2h
bounce_queue_lifetime = 2h
maximal_backoff_time = 900s
minimal_backoff_time = 300s
queue_run_delay = 300s

Postfix graveyard MTA / Private IP – e.g.

maximal_queue_lifetime = 16h
bounce_queue_lifetime = 16h
maximal_backoff_time = 360s
minimal_backoff_time = 120s
queue_run_delay = 120s

# postqueue -p
# postqueue -c /etc/postfix.graveyard -p
# postsuper -r ALL && postqueue -f
# postsuper -c /etc/postfix.graveyard -r ALL && postqueue -c /etc/postfix.graveyard -f
Postfix mynetworks MTA / Public IP – e.g.

maximal_queue_lifetime = 4h
bounce_queue_lifetime = 4h
maximal_backoff_time = 1800s
minimal_backoff_time = 600s
queue_run_delay = 600s

Your mileage may vary …

Source: http://www.postfix.org/TUNING_README.html

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