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Whenever something is not working as expected, the first step for troubleshooting the problem is checking your log. Postfix logs all operations whether successful or not. Postfix uses your system's syslog facility to write messages to your log file. Because system logging differs on different platforms, you should review your system documentation to learn about syslog. Most likely, you can find where Postfix logging occurs by checking your system's /etc/syslog.conf file. In the examples below, we'll assume that the log file is located at /var/log/maillog.