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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. New mail has to wait until a delivery agent becomes available.
https://serverfault.com/questions/252793/postfix-very-slow-sending-mail
If you can configure Postfix to do immediate delivery, then each message should use its own thread. I don't know if Postfix supports multiple delivery threads. Multiple threads can create synchronization issues which may slow down your server. High volume delivery …
https://wiki.list.org/DOC/MTA%20Performance%20Tuning%20Tips%20for%20Postfix
As lists get larger, Postfix delivery with out-of-the box configuration really slows down. The bottlenecks I've found are queue length and number of SMTP processes, both of which default to values too small for large lists. I began noticing pretty severe rate limiting at about 10,000 deliveries on a list.
http://www.karoltomala.com/blog/?p=576
Server is out of network sockets, which would mean that mail server is under heavy load, signaling probable Denial Of Service attack. Or the application – in this case the Postfix mail server – is running very slow for some reason. After logging into mail server I have checked “htop” for signs of overload.
https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/TUNING_README_008.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. New mail has to wait until a delivery agent becomes available.
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://www.linux.com/tutorials/destress-your-mail-server-postfix-troubleshooting-tips-part-2/
Jun 03, 2016 · The usual default value of 20 drops to just one. Very sensibly, Postfix is far less sympathetic to mail client problems when it’s busy, as you can see. Our battle-hardened MTA also massively reduces the value for “smtpd_junk_command_limit” all the way …Author: Chris Binnie
https://stackoverflow.com/questions/50056664/postfix-with-smtp-slow-sending-speed
Postfix with SMTP slow sending speed. I have configured an SMTP server for sending emails to our customers, we are an IT company. For this, I have used Postfix MTA with Cyrus. All things working fine except one thing, the sending speed is too slow. It is sending around 1 mail per 5 seconds (approx).
http://postfix.1071664.n5.nabble.com/Rate-control-for-SMTP-delivery-to-speicific-domain-td47170.html
On Tue, 30 Mar 2010, Mike Hutchinson wrote: > It appears that whenever I use the smtphotmail transport rules, instead of > the global ones, delivery attempts to the domain increase as if there was no > limitation.. Ie: after a Postfix reload, I follow the mail.info log and find > straight after the reload that there are instantly pages and pages of > delivery attempts to hotmail.com.
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