Which file holds syslog messages related to the mail server?

The file that holds syslog messages related to the mail server is typically found at the location /var/log/maillog. This file is specifically designated for logging mail server activities and events, making it easy for system administrators to track issues, monitor performance, and maintain the mail system.

In many Linux-based systems, particularly those based on Red Hat distributions, the logging can be configured to various files depending on the daemon and system configuration. The /var/log/mail.log file might be used in some distributions or configurations, but it is less common in the default setup of Red Hat-based systems. Similarly, while /var/log/messages captures a wide range of system messages and logs from various services, it does not specifically isolate mail server logs, which is why it wouldn’t be the best answer for this question. The file /var/log/mailinfo is not a standard log file related to mail servers in common usage. Hence, the standard log file for mail server messages is /var/log/maillog, making it the most accurate choice.