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http://www.postfix.org/DEBUG_README.html
Postfix version 2.1 and later can produce mail delivery reports for debugging purposes. These reports not only show sender/recipient addresses after address rewriting and alias expansion or forwarding, they also show information about delivery to mailbox, delivery to non-Postfix command, responses from remote SMTP servers, and so on.
https://serverfault.com/questions/943005/setting-postfix-for-outbound-email-via-smtp-with-local-root-delivery-for-cron-re
I recently had to diagnose a couple of servers running Postfix which emailed results of rsync cronjobs when they returned a non-OK value. While Postfix was emailing the recipients on rsync failure, I noticed that the cronjob STDOUT was not being locally relayed correctly to the root mail.
http://www.postfix.org/DSN_README.html
Postfix version 2.3 introduces support for Delivery Status Notifications as described in RFC 3464. This gives senders control over successful and failed delivery notifications. Specifically, DSN support gives an email sender the ability to specify: What notifications are sent: success, failure, delay, or none.
https://www.howtoforge.com/community/threads/postfix-send-sender-non-delivery-notification-for-not-existing-domain-alias-account.70707/
Aug 05, 2015 · 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. Is this a configuration problem I …
https://xf-wiki.mithi.com/index.php/Diagnosing_problems_in_Postfix_using_Mail_Delivery_reports
Debugging Postfix from inside. With Postfix version 2.1 and later you can ask Postfix to produce mail delivery reports for debugging purposes. These reports not only show sender/recipient addresses after address rewriting and alias expansion or forwarding, they also show information about delivery to mailbox, delivery to non-Postfix command, responses from remote SMTP servers, and so on.
https://unix.stackexchange.com/questions/441651/where-is-the-postfix-mail-delivery-status-report
I'm using CentOS 7. I wanted to test my PostFix mail forwarding so I ran [root@server /]# echo "Subject: sendmail test" sendmail -v [email protected] Mail Delivery Status Report will be mailed to <root>. I don't see the email received at my forwarding address and I can't figure out where the log of what happened is. I checked
https://www.linuxquestions.org/questions/linux-server-73/postfix-relay-won%27t-send-non-delivery-notifications-922816/
Jan 11, 2012 · Our only problem is, when sending by EMM, the Postfix server won't send any non-delivery report back to sendmail in case the mail is undeliverable (ex. to [email protected]). However if we send the same message by CLI, Postfix will send it.
http://postfix.1071664.n5.nabble.com/How-to-disable-Postfix-Mail-Delivery-Report-td45782.html
> > If email message cannot be delivered to customer, it must be silently > discarded without non-delivery report to sender. > > Is the a way to completely disable Postfix Mail Delivery Report? the way to do that is to use "<>" as the sender, not none@*. ... How to disable Postfix Mail Delivery Report ...
https://www.digitalocean.com/community/questions/postfix-send-email-but-it-s-not-received
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