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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. When mail is being deferred frequently, fixing the problem is always better than increasing the frequency of delivery attempts.
https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/TUNING_README_008.html
Tuning the frequency of deferred mail delivery attempts. When a Postfix delivery agent ( smtp(8), local(8), etc.) is unable to deliver a message it may blame the message itself, or it may blame the receiving party. When the delivery agent blames the message, the queue manager gives the queue file a time stamp into the future, so it won't be looked at for a while.
https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/QSHAPE_README_007.html
The postdrop(1) program is a setgid helper that allows the unprivileged Postfix sendmail(1) program to inject mail into the " maildrop" queue and to notify the pickup(8) service of its arrival. All mail that enters the main Postfix queue does so via the cleanup(8) service.
https://wiki.zimbra.com/wiki/Tuning_Postfix_Queue_Settings
Some system administrators will want to control the queue lifetime or even how frequently a message in the deferred queue is selected for redelivery. This article contains information for tuning Postfix queue settings to configure both Postfix queue lifetime and Postfix deferred queue parameters.
https://computingforgeeks.com/postfix-administration-commands-cheat-sheet/
Mar 02, 2018 · Use of the postsuper command is restricted to the superuser of the Mail server. By default, postsuper performs the operations requested with the -s, and -p command-line options on all Postfix queue directories – this includes the incoming, active and deferred directories with mail files and the bounce, defer,...
http://www.postfix.org/QSHAPE_README.html
When a destination is unable to handle the load even after the Postfix process limit is reduced to 1, a desperate measure is to insert brief delays between delivery attempts. Postfix version 2.5 and later: In master.cf set up a dedicated clone of the "smtp" transport for the problem destination. In the example below we call it "slow".
https://www.cyberciti.biz/tips/howto-postfix-flush-mail-queue.html
Oct 25, 2007 · Postfix Illegal seek / queue file write mail server… Postfix mail server block .bat, .exe .com .vbs mime… Postfix masquerading or changing outgoing SMTP email… Postfix Mail Server Security Update [moderate… Postfix and MS-Exchange Mail Server Affected by… Postfix mail server limit the mailbox size; Howto install and configure OpenBSD ...
http://manpages.ubuntu.com/manpages/trusty/man8/local.8postfix.html
The local (8) daemon processes delivery requests from the Postfix queue manager to deliver mail to local recipients. Each delivery request specifies a queue file, a sender address, a domain or host to deliver to, and one or more recipients. This program expects to be run from the master (8) process manager.
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