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http://www.postfix.org/TUNING_README.html
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://serverfault.com/questions/661293/postfix-very-slow-delivery
Postfix very slow delivery. Ask Question Asked 5 years, 2 months ago. ... peer_level = 2 delay_warning_time = 4 disable_vrfy_command = yes html_directory = no inet_interfaces = all mail_owner = postfix mailbox_size_limit = 2048000000 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man message_size_limit = 204800000 ...
http://www.postfix.org/postconf.5.html
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).
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://forum.netgate.com/topic/56763/postfix-slow-email-delivery
Postfix slow email delivery Postfix slow email delivery. This topic has been deleted. Only users with topic management privileges can see it. A. ant2ne last edited by . After setting up postfix, users are complaining that it takes too long to receive emails. It can take half a day or more after an email is sent.
https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/QSHAPE_README_007.html
For high volume sites a key tuning parameter is the number of "smtp" delivery agents allocated to the "smtp" and "relay" transports. High volume sites tend to send to many different destinations, many of which may be down or slow, so a good fraction of the available delivery …
https://www.linuxquestions.org/questions/linux-networking-3/postfix-slow-transport-411474/
Feb 04, 2006 · I want to set postfix to use a "slow" transport for a particular site, because this site has limited a low rate for mail delivery, ... Postfix: slow transport? ... because this site has limited a low rate for mail delivery, I did this: Code: # vi /etc/postfix/master.cf smtp unix - - n - 15 smtp # When relaying mail as backup MX, disable ...
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.
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.
https://blog.mailtrap.io/postfix-sendmail-exim/
Oct 28, 2019 · Postfix, despite its security-orientation, provides a high level of flexibility and ease of administration. For beginner admins, Postfix would be easier to set up than any other MTA. Besides, it implements the Sendmail CLI and is compatible with Sendmail mail filters. However, Postfix is less versatile than Exim.
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