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Update main.cf 

Added the delay_warning_time (http://www.postfix.org/postconf.5.html#delay_warning_time) with 4 hours as setting. Postfix will inform the user that the e-mail has not been delivered, but that it will try for the next 5 days. 

There is also a setting called confirm_delay_cleared (http://www.postfix.org/postconf.5.html#confirm_delay_cleared), but according to the Postfix this can lead to a sudden burst of notifications at the end of a prolonged network outage.
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dofl 2019-06-09 07:39:36 +02:00 committed by GitHub
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commit fa4c4b138e
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@ -20,6 +20,7 @@ broken_sasl_auth_clients = yes
disable_vrfy_command = yes
maximal_backoff_time = 1800s
maximal_queue_lifetime = 5d
delay_warning_time = 4h
message_size_limit = 104857600
milter_default_action = accept
milter_protocol = 6