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https://serverfault.com/questions/279803/postfix-how-to-retry-delivery-of-mail-in-queue
seems -f is flush and -q is queue (send the queue) – erm3nda Apr 9 '15 at 5:32. there is no postqueue -q. There is sendmail -q to support sendmail syntax so postfix can completely replace sendmail, but that's a synonym. The different letters are jsut because postfix chose different ones than sendmail did.
https://jrs-s.net/2013/04/17/configuring-retry-duration-in-postfix/
Apr 17, 2013 · Configuring retry duration in Postfix. By default, Postfix (like most mailservers) will keep trying to deliver mail for unconscionably long periods of time – 5 days. Most users do NOT expect mail that isn’t getting delivered to just sorta hang out for 5 days before they find out it didn’t go through – the typical scenario is...
https://www.linuxquestions.org/questions/linux-server-73/postfix-relay-won%27t-send-non-delivery-notifications-922816/
Jan 11, 2012 · The company mail server is running postfix. This setup is working so far, e-mails sent by our OpenEMM server are relayed and delivered to the final recepient - No problem here. However, for non-existing recepients, postfix will not send any non-delivery notification back to sendmail - …
https://www.howtoforge.com/community/threads/postfix-send-sender-non-delivery-notification-for-not-existing-domain-alias-account.70707/
Aug 05, 2015 · Postfix accept message and redirect to amavis; Amavis returned and postfix rewrite domain (Log 2) Postfix regonize not existing mailbox and create "sender non-delivery notification" for an not existing source address; I know, why it is happen. Postfix don't know in case of domain alias at first step, if the mailbox exist.
http://www.postfix.org/bounce.8.html
A non-delivery notifica- tion is sent even when the log file or the original message cannot be read. Optionally, a bounce (defer, trace) client can request that the per-message log file be deleted when the requested operation fails.
https://linux-audit.com/postfix-hardening-guide-for-security-and-privacy/
Another reason for Postfix hardening is the increasing need for privacy. Most of the legacy protocols, SMTP included, did not have security or privacy high on the priority list. These protocols may share data with other systems without any form of protection. This may result in …
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://talk.plesk.com/threads/configure-postfix-bounce-notification-recipient.341062/
Nov 23, 2019 · Hello, I am trying to to configure the postfix bounce notification email, so that I am notified whenever Postfix is unable to deliver a message. Here's what I'm seeing in the mail log when one of my virtual hosts (testdomain.com) tries to send an email to a non-existent gmail account: Jan 11...
https://www.networkinghowtos.com/howto/flush-the-postfix-mail-queue-to-force-retry/
Apr 05, 2012 · Flush the Postfix mail queue to force retry April 5, 2012 Linux Typically if a mail server can’t connect to a remote mail/SMTP server, it will keep the email in a queue and periodically retry sending the email until it is either successful, or fails after a specific time frame which set in the mail server configuration.
https://linux.die.net/man/8/defer
A non-delivery notification is sent even when the log file or the original message cannot be read. Optionally, a bounce (defer, trace) client can request that the per-message log file be deleted when the requested operation fails. This is used by clients that cannot retry transactions by themselves, and that depend on retry logic in their own client.
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