How To Install SquirrelMail on CentOS 7

Install SquirrelMail on CentOS 7

In this tutorial, we will show you how to install SquirrelMail on your CentOS 7. For those of you who didn’t know, Squirrelmail is one of the most popular Web-based email clients written in PHP. It has built-in pure PHP support for IMAP and SMTP, and it is designed to render all pages in pure HTML 4.0 with no JavaScript required, for maximum compatibility across browsers.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of SquirrelMail email clients on a CentOS 7 server.


  • A server running one of the following operating systems: CentOS 7 or RHEL-based.
  • It’s recommended that you use a fresh OS install to prevent any potential issues.
  • SSH access to the server (or just open Terminal if you’re on a desktop).
  • A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install SquirrelMail on CentOS 7

Step 1. First, let’s start by ensuring your system is up-to-date.

yum clean all
yum install epel-release
yum -y update

Step 2. Installing SquirrelMail on CentOS 7.

Install SquirrelMail using the yum default package manager:

yum install squirrelmail

Step 3. Configure SquirrelMail.

Once the webmail client is installed, you can configure it according to your needs by running the configuration script:

cd /usr/share/squirrelmail/config/

SquirrelMail Configuration : Read: config.php (1.4.0)
Main Menu --
1.  Organization Preferences
2.  Server Settings
3.  Folder Defaults
4.  General Options
5.  Themes
6.  Address Books
7.  Message of the Day (MOTD)
8.  Plugins
9.  Database
10. Languages

D.  Set pre-defined settings for specific IMAP servers
C   Turn color off
S   Save data
Q   Quit

Command >>

There are different settings in the configuration file, but the main things that should be checked and configured are:

  • Set your default domain name (2. Server settings > 1. Domain)
  • Addresses of IMAP and SMTP servers.
  • Type of IMAP server.

Step 4. Accessing SquirrelMail.

SquirrelMail will be available on HTTP port 80 by default. Open your favorite browser and navigate to http://your-domain.com/squirrelmail or http://your-server-ip/squirrelmail and complete the required steps to finish the installation.

Congratulations! You have successfully installed SquirrelMail. Thanks for using this tutorial for installing SquirrelMail email clients in CentOS 7 systems. For additional help or useful information, we recommend you check the official SquirrelMail website.

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r00t is a seasoned Linux system administrator with a wealth of experience in the field. Known for his contributions to idroot.us, r00t has authored numerous tutorials and guides, helping users navigate the complexities of Linux systems. His expertise spans across various Linux distributions, including Ubuntu, CentOS, and Debian. r00t's work is characterized by his ability to simplify complex concepts, making Linux more accessible to users of all skill levels. His dedication to the Linux community and his commitment to sharing knowledge makes him a respected figure in the field.
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