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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.
https://serverfault.com/questions/661293/postfix-very-slow-delivery
I installed postfix + dovecot + mysql + amavisd + spamassasin. Everything works fine (mail is sent and received) except that the received mail stays too long in the queue (for about 15 …
https://forum.netgate.com/topic/56763/postfix-slow-email-delivery
However, postfix saves the IP address for a period (1 day by default) and will pass the message the second time through. This is to stop spam bots, which rarely try more than once. Postfix learns the IP addresses of (good) remote mail servers over time but many ISPs and big …
http://www.postfix.org/QSHAPE_README.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://stackoverflow.com/questions/50056664/postfix-with-smtp-slow-sending-speed
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). I have spent 4-5 days already for finding the issue, but not found any solution. There is no problem in my maillog file My Maillog File:
https://blog.mailtrap.io/postfix-sendmail-exim/
Oct 28, 2019 · Full-fledged MTAs, also known as mail hubs, can handle all the details of the Internet mail delivery. As a rule, this type of mail transfer agent receives emails from relay-only MTAs and then relays them forward. Postfix, Sendmail, and Exim fall into this category. To choose the best option for your needs, you should consider a few selection ...
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/problem-to-send-an-email-from-oer-server-to/58250822-ff7e-4dd5-833b-61a78a483557
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