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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.
http://www.postfix.org/postconf.5.html
lmtp_rset_timeout (default: 20s) The Postfix LMTP client time limit for sending the RSET command, and for receiving the remote LMTP server response. The LMTP client sends RSET in order to finish a recipient address probe, or to verify that a cached connection is still alive. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks).
https://support.plesk.com/hc/en-us/articles/360000543074-Postfix-fails-to-start-Job-for-postfix-service-failed-because-a-timeout-was-exceeded
Jul 20, 2019 · Symptoms. Postfix fails to start: # systemctl start postfix.service Job for postfix.service failed because a timeout was exceeded. See "systemctl status postfix.service" and "journalctl …
https://stackoverflow.com/questions/39271209/postfix-connection-time-out
postfix- connection time out. 2 Answers 2. You need to check your internet connection first. Then find out the interface that internet connection is on. if you don't have a default route on that interface, you need to add one. and then postqueue -f to retry the deferred email or try sending a new one.
https://www.howtoforge.com/configure-custom-postfix-bounce-messages
delay_warning_time: The time after which the sender receives the message headers of mail that is still queued. The postconf -n command shows the settings that are currently configured in /etc/postfix/main.cf , whereas the postconf -d command shows the default settings that are valid unless something else is set in /etc/postfix/main.cf .Author: Falko Timme
https://major.io/2007/09/18/adjusting-postfix-queue-time-lifetime/
If you want to adjust how long postfix will hold a piece of undeliverable mail in its queue, just adjust bounce_queue_lifetime. This variable is normally set to five days by default, but you can adjust it to any amount that you wish.
https://www.howtoforge.com/community/threads/postfix-connection-timed-out-error-when-trying-to-send.19997/
Feb 20, 2008 · Have postfix running on Fedora 8 with ISPConfig... able to receive mail, but, not send it out. Can send locally, however. When trying to send...
https://unix.stackexchange.com/questions/187304/postfix-smtp-connection-timed-out-why
A CentOS 7 web server has postfix, dovecot, and mailx installed. ... postfix smtp connection timed out, why? Ask Question Asked 4 years, 11 months ago. Active 4 years, ... I still got the same Connection timeout failure, but there was no activity reported by the open tcpdump port 25 commands.
https://help.ubuntu.com/lts/serverguide/postfix.html
Postfix is the default Mail Transfer Agent (MTA) in Ubuntu. It attempts to be fast and easy to administer and secure. It is compatible with the MTA sendmail. This section explains how to …
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