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https://easyengine.io/tutorials/mail/postfix-debugging/
Oct 14, 2013 · Check postfix mail logs. When you run into postfix or email issues, first thing, you should check is postfix mail logs which are present in /var/log/mail.log file. It contains postfix’s general logs. Keeping tail -f /var/log/mail.log running in a separate terminal window will be helpful.
https://serverfault.com/questions/628506/how-to-verify-if-an-email-was-successfully-sent-by-postfix
By default, Postfix creates at least two log lines for a piece of outgoing mail it handles: For the receiving and the sending part. My guess is that you grepped for the local user, not the remote user, and therefore didn't see the second line.
https://unix.stackexchange.com/questions/441651/where-is-the-postfix-mail-delivery-status-report
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.
https://ubuntu.com/server/docs/mail-postfix
Mail-Stack Delivery. Another option for configuring Postfix for SMTP-AUTH is to use the mail-stack-delivery package. This package will install Dovecot and configure Postfix to use it for both SASL authentication and as a Mail Delivery Agent (MDA). Note
https://cloudmin.com/node/15463
Recently users have been reporting that mail randomly is not delivered from outside SMTP servers to internal accounts. What's strange with an issue I've tried to track down today, I can see Google's servers connection all the way through to the Postfix/Cleanup process.
https://www.linode.com/docs/email/postfix/troubleshooting-problems-with-postfix-dovecot-and-mysql/
Oct 31, 2019 · Check the Logs If Postfix, Dovecot, and MySQL are running, the next troubleshooting step is to check the mail logs. By default, all of the incoming and outgoing connections and any associated errors get logged in /var/log/mail.log.
http://www.tech-g.com/2012/07/15/inspecting-postfixs-email-queue/
Jul 15, 2012 · 1- Postfix maintains two queues, the pending mails queue, and the deferred mail queue, the differed mail queue has the mail that has soft-fail and should be retried (Temporary failure), Postfix retries the deferred queue on set intervals (configurable, and by default 5 minutes) In any case, the following commands should be useful.
http://www.postfix.org/DEBUG_README.html
Postfix can produce two types of mail delivery reports for debugging: What-if: report what would happen, but do not actually deliver mail. This mode of operation is requested with: % /usr/sbin/sendmail -bv address... Mail Delivery Status Report will be mailed to <your login name>.
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