You will need to debug postfix, when you are facing email related issues like emails are not sent, emails are delivered but with a long delay, mail bounces, etc.
In this article, we will first see how we can check if postfix itself can send emails. It will be followed by checking postfix mail logs for errors and finally inspecting mail queues to diagnose different postfix related problems.
If your WordPress or PHP or any other application is not able to send emails, first thing you should check if postfix can send emails itself.
Please replace [email protected] Its better to run a test with your free email id with gmail, yahoo, etc first. If you can receive test mail sent above then that means postfix is able to send emails. You can run command postconf -n and it will show postfix config in action!
This is very convenient as reading config files with lots of comments can get tiring sometimes. Learn more. Where are the postfix log files? Ask Question. Asked 8 years ago. Active 1 year, 2 months ago.
Viewed k times. Where can i see which configuration file postfix uses? Hint: I use postfix together with dovecot. I installed meta package some months ago. For more information see syslog. First some standard logfiles. Log by facility. Split it up so that it is easy to write scripts to parse these files.
Logging for INN news system news. Improve this question. Braiam Steve Rakebrandt Steve Rakebrandt 1, 1 1 gold badge 7 7 silver badges 5 5 bronze badges. If that's not present or it does not log there, then please clarify what you changed to your system. Logging to file solves a usability problem for MacOS, and eliminates multiple problems for systemd-based systems. Add the following line to master. Note: the service type " unix-dgram " was introduced with Postfix 3. Remove the above line before backing out to an older Postfix version.
See also the " Logfile rotation " section below for logfile management. At this point the mail is saved with its final size in the incoming queue.
This daemon is responsible for correcting any syntax error in the mail structure which is not in compliance with RFC These kind of corrections may include some of the following:.
The value is taken from the actual date and time from the receiving MTA server Postfix. Its value is generated using the actual algorithms from the receiving MTA server Postfix. The cleaning process takes place inside the incoming queue. This daemon is responsible for moving the mails left by qmgr to the appropriate queue. This line is generated when the daemon has already tried to send the mail and reflects the result of this operation.
In our example, the different fields are:. At this point you can assume that the reception process was completed successfully. Here you can see all data transaction states. Line 2 confirms that our mail was successfully delivered to all recipients so now Postfix is free to drop its original copy of this mail. Identifying all connections made to Postfix. To identify all IP addresses that have connected to our Postfix servers just execute one or all of the following commands:.
This command will show you a complete list of all lines containing the IP addresses of all servers that have connected to our Postfix server. In this case you can exclude such connections with the following command:. This command will give you all lines of Postfix containing a record of all the IP addresses that have connected to Postfix except for your internal mail server, in this case our internal mail server has IP This command gives you the same result except that it also excludes the local address of Postfix.
This is useful when you are using Postfix as part of your Gateway security solution. Identifying incoming mail in Postfix maillog. This command will give all lines of maillog where mail has been delivered locally in your Postfix server. If you use Postfix as a relay for your internal server you can filter maillog using the IP of the internal mail server.
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