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https://www.networkinghowtos.com/howto/flush-the-postfix-mail-queue-to-force-retry/
Apr 05, 2012 · This tip shows you how to flush the Postfix mail queue, which will retry any emails that are waiting to send, or waiting to be resent (due to errors such as DNS resolution, or connectivity problems). The “postqueue” command outlined below allows you to force a retry …
https://www.linuxquestions.org/questions/linux-server-73/get-postfix-to-retry-on-maildir-delivery-failure-postfix-2-6-6-centos-6-3-a-4175446361/
Jan 19, 2013 · Get postfix to retry on maildir delivery failure (postfix 2.6.6, Centos 6.3)? All home directories are NFS-mounted by the automounter, i.e., they are only mounted when needed. I recently sent an email to a group of users (all of whose home directories are on the same server), and all but one of the messages got delivered.
https://jrs-s.net/2013/04/17/configuring-retry-duration-in-postfix/
Apr 17, 2013 · Configuring retry duration in Postfix. By default, Postfix (like most mailservers) will keep trying to deliver mail for unconscionably long periods of time – 5 days. Most users do NOT expect mail that isn’t getting delivered to just sorta hang out for 5 days before they find out it didn’t go through – the typical scenario is that a ...
https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/TUNING_README_008.html
All available Postfix delivery agents become occupied trying to connect to unreachable sites etc. New mail has to wait until a delivery agent becomes available. This is a slow process that usually requires timing out one or more SMTP connections.
https://www.golinuxcloud.com/configure-postfix-mail-server-smtp-relay-rhel/
Nov 18, 2019 · Postfix is a Mail Transport Agent (MTA) responsible for the transfer of e-mails between mail servers using the SMTP protocol. In this article I will share the steps to configure postfix mail server and client using postfix SMTP relay along with some examples to check SMTP server check configuration and connection in CentOS/RHEl 7/8 Linux.
http://www.postfix.org/TUNING_README.html
All available Postfix delivery agents become occupied trying to connect to unreachable sites etc. New mail has to wait until a delivery agent becomes available. This is a slow process that usually requires timing out one or more SMTP connections.
http://www.postfix.org/postsuper.1.html
Warning: Postfix queue IDs are reused (always with Postfix <= 2.8; and with Postfix >= 2.9 when enable_long_queue_ids=no). There is a very small possibility that postsuper requeues the wrong message file when it is executed while the Postfix mail system is running, but no harm should be done. This feature is available in Postfix 1.1 and later.
https://www.lunanode.com/guides/postfix_smtp_secure
You already have a mail server, and want your web applications to send e-mail via local Postfix instead of directly connecting to your mail server from the application. This reduces latency in the application, and also makes delivery more reliable (Postfix will retry sending the message several times).
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