How to Find Out Postfix Mail Server Version in Linux?


The Postfix mail server is a fast, secure, and reliable open-source mail transfer agent (MTA) for Linux-based systems. It was designed with security in mind and provides a number of features that make it an excellent choice for businesses that require high-performance email services. Postfix has been widely adopted and is currently one of the most popular MTAs available.

Explanation of Postfix Mail Server

Postfix was created by Wietse Venema in 1998 as a more secure replacement for the widely used Sendmail MTA. Since its inception, Postfix has been widely adopted by organizations of all sizes due to its reliability, scalability, and security features. The software is written in C programming language and runs on various platforms including Linux, macOS, BSD Unix systems.

Postfix offers several features that make it an attractive option for businesses such as support for multiple domains, virtual hosting capabilities, and built-in anti-spam measures. Unlike Sendmail which relies heavily on external tools to provide some of these features (such as domain management), Postfix includes them out-of-the-box.

Importance of Knowing the Postfix Mail Server Version in Linux

Knowing the version number of your Postfix mail server can be critical when maintaining or troubleshooting your system. It helps you determine whether your installation is up-to-date or if there are any known vulnerabilities that need to be addressed. Moreover, different versions may have different configuration options or syntax changes which could affect how your system operates or interacts with other software components.

Therefore knowing the postfix version number can help avoid conflicts when installing new software packages or upgrading existing ones.

Checking Postfix Mail Server Version

Using Command Line Interface (CLI)

The command line interface, or CLI, is a powerful tool for accessing and managing your Linux system. To check the postfix mail server version using the CLI, you will need to open a terminal window.

This can typically be accomplished by pressing Ctrl+Alt+T on your keyboard. Once the terminal window is open, you will need to run a specific command to retrieve the postfix mail server version information.

Accessing the CLI

To access the CLI, you will first need to locate your terminal application. In most Linux distributions, this can be found in the Applications menu under System Tools or Accessories. Once you have located your terminal application, simply click on it to launch it.

Running the command to check postfix mail server version

To check the postfix mail server version using the CLI, you will need to enter a specific command into your terminal window. The command that you will need to enter is "postconf -d | grep mail_version". This command instructs Postfix to display information about its configuration settings and then filters out only information related to its mail server version.

postconf -d | grep mail_version

Using Graphical User Interface (GUI)

For those who prefer a graphical user interface (GUI) over a CLI, there is also an option for checking postfix mail server version information. To access this option, simply navigate through your Linux distribution's graphical menus until you find an option for accessing system information.

Accessing the GUI

To access the GUI for checking postfix mail server version information in Linux, navigate through your distribution's menus until you find an option for accessing system information. On some distributions this may be located under System Settings or Administration.

Navigating to the postfix mail server version information

Once you have accessed the GUI for checking postfix mail server version information, navigate to the section that displays system information. Depending on your distribution, this may be located under a tab labeled "Details" or "System Information." Look for information related to postfix mail server version here. Typically, it will be listed either as "Postfix Version" or "Mail Version".

Understanding Postfix Mail Server Version Information

Knowing how to check the version of your Postfix mail server is important, but it is equally important to understand what the version information means. The version number consists of several elements that provide information about the mail server. The information contained in the version number includes major, minor, and patch versions, release date, and build number.

Breakdown of Version Information

Major versions are typically indicated by a change in the first digit of the version number. A change in major versions often indicates significant changes or new features for the software. Minor versions are indicated by a change in the second digit of the version number.

Minor versions generally include smaller changes or bug fixes than major updates. Patch versions are typically indicated by a change in the third digit of the version number and often include minor bug fixes.

Explanation of How to Interpret Version Information

Interpreting postfix mail server version information can be tricky without proper context and understanding. A high minor or patch may indicate that an older stable release is still receiving maintenance upgrades rather than new feature releases (which would have changed its major).

Similarly, frequent updates with low patch or build numbers suggest an active development team addressing issues as they come up. If you're looking for any specific functionality or feature set from a particular postfix mail server release, then understanding what was added/fixed at each subsequent update will help you prioritize which updates you need to apply.

Advanced Techniques for Finding Postfix Mail Server Version in Linux

Checking Configuration Files: In-Depth Look into Postfix Settings

One of the most effective ways to find postfix mail server version is by examining the configuration files. These files contain all of the settings and configurations that are used by postfix on a Linux system.

The configuration files can be found in different locations depending on your distribution, but they are usually located in "/etc/postfix/". Once you have located the configuration files, you can use a text editor (such as nano or vi) to open them and search for information about postfix version.

In particular, you should look for lines that contain "mail_version" or "myhostname" as these will provide information about the postfix version that is installed on your system. Moreover, examining configuration files can also give insight into other settings used by postfix such as relayhosts, virtual domains and aliases.

Checking Package Managers: Monitor Installed Versions of Postfix

Another way to check the version of postfix mail server is via package managers. Package managers are tools that help manage software installations on a Linux system and ensure that they stay up-to-date with any necessary patches or updates. There are several package managers for different distributions such as dpkg/apt-get (Debian based), rpm/yum/dnf (Red Hat based) among others.

To check if postfix has been installed using a package manager and find out what version it is running on, use commands similar to this one −

dpkg -s postfix | grep Version 

This command will list detailed information regarding some details about the installation including timestamp among other things. It is worth keeping an eye out for security updates available through these package management systems too; important patches often come with new versions but may not happen automatically!


In the world of Linux system administration, being able to identify the version of software running on your server is a crucial skill. Knowing the postfix mail server version in Linux can help you determine if your server is up-to-date with security patches and other critical updates.

Throughout this tutorial, we went over various methods for finding out the postfix mail server version in Linux, including both command-line and graphical user interface options. We also discussed how to interpret version information and delved into more advanced techniques such as checking configuration files and package managers.

Updated on: 09-Jun-2023


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