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https://www.experts-exchange.com/questions/26658730/How-do-I-pause-postfix-email-delivery.html
What I need to be able to do is pause mail delivery, while postfix is still accepting email from exchange. That way I can let exchange flush out the crap, I can force all of it into the postfix queue, where I can sanitize it before turning postfix delivery processing again.
http://postfix.1071664.n5.nabble.com/pause-mail-delivery-while-Postfix-still-running-td13057.html
pause mail delivery while Postfix still running?. On one of our boxes, Postfix was down for a few days, which coincide with a too-agressive cron script sending out thousands of messages which were all...
http://www.postfix.org/TUNING_README.html
The active queue becomes saturated with mail that has delivery problems. New mail enters the active queue only when an old message is deferred. This is a slow process that usually requires timing out one or more SMTP connections. All available Postfix delivery agents become occupied trying to connect to unreachable sites etc.
https://www.howtoforge.com/community/threads/postfix-how-to-delay-emails.54061/
Aug 09, 2018 · My bad, I misunderstood your answer for sure, so no sample postfix config, so I'll need to create one with some additional resource. TBH, I don't understand what you are trying to say in the long version MUA-s configured already, the function/capability has not there yet in the MTA side. So sending an e-mail when close it? Help me out, pls. Thanks!
https://www.nixtips.net/useful-postfix-one-liners/
sudo postconf -e defer_transports=smtp;sudo postfix reload : pause email delivery but still accept email. May be useful when needing to queue a large number of mail at once or when a mail needs to be deleted from the mail queue without stopping the mail server
https://linux.die.net/man/8/lmtp
The recipient of postmaster notifications about mail delivery problems that are caused by policy, resource, software or protocol errors. internal_mail_filter_classes (empty) What categories of Postfix-generated mail are subject to before-queue content inspection by non_smtpd_milters, header_checks and body_checks. notify_classes (resource ...
https://linux.die.net/man/5/postconf
Report mail delivery errors to the address specified with the non-standard Errors-To: message header, instead of the envelope sender address (this feature is removed with Postfix version 2.2, is turned off by default with Postfix version 2.1, and is always turned on with older Postfix versions). enable_original_recipient (default: yes)
https://www.linuxquestions.org/questions/linux-server-73/postfix-email-getting-delayed-937739/
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http://www.postfix.org/SCHEDULER_README.html
The queue manager is by far the most complex part of the Postfix mail system. It schedules delivery of new mail, retries failed deliveries at specific times, and removes mail from the queue after the last delivery attempt. There are two major classes of mechanisms that …
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