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http://www.postfix.org/postconf.5.html
The Postfix LMTP client time limit for completing a TCP connection, or zero (use the operating system built-in time limit). When no connection can be made within the deadline, the LMTP client tries the next address on the mail exchanger list. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds).
https://serverfault.com/questions/848029/postfix-sending-emails-with-delay
I just configures Postfix to send emails. If I send an email after a few hours the email is received instantly. If I send multiple emails at …
https://www.howtoing.com/configure-custom-postfix-bounce-messages/
The mail system EOF # # The delay template is used when mail is delayed. Note a neat trick: # the default template displays the delay_warning_time value as hours # by appending the _hours suffix to the parameter name; it displays # the maximal_queue_lifetime value as days by appending the _days # suffix.
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