SquirrelMail Webmail Installation on CentOS

This section provides a tutorial example on how to install SquirrelMail on CentOS computers as a Web-based email client tool.

What Is SquirrelMail? SquirrelMail is a free open source Web-based email client tool for Linux systems that integrates to Postfix and Dovecot local servers. It includes built-in pure PHP support for IMAP and SMTP, and renders all pages in pure HTML 4.0 for maximum compatibility across browsers. It has strong MIME support and a flexible plugin system.

The latest stable version is SquirrelMail 1.4.22, which seems to be outdated (released in 2011). So I decided to try the "stable version snapshot" version, SquirrelMail 1.4.23-svn, released in 2020.

1. Go to SquirrelMail Website at http://squirrelmail.org.

2. Click "Download" from the left menu. You see the download page.

3. Click "squirrelmail-20201119_0200-SVN.stable.tar.gz" to download it.

4. Unzip and un-tar the download file. You see the ./squirrelmail.stable/squirrelmail sub-directory.

5. Install SquirrelMail on the web server. Remember to backup the old Webmail HTML directory, if exists.

herong$ sudo mv /var/www/html/mail /var/www/html/mail-old

herong$ sudo mv ./squirrelmail.stable/squirrelmail /var/www/html/mail

6. Fix ownership and security context.

herong$ cd /var/www/html

herong$ sudo chown -R root mail
herong$ sudo chgrp -R root mail
herong$ sudo chcon -R -t httpd_sys_content_t mail

7. Test installation by open in a Web browser. You see SquirrelMail documentations. Read the "INSTALL - Installation instructions" page.

SquirrelMail Webmail - Web-Based Email Client
SquirrelMail Webmail - Web-Based Email Client

Table of Contents

 About This Book

 Introduction to Linux Systems

 Process Management

 Files and Directories

 Running Apache HTTP Server (httpd) on Linux Systems

 Running Apache Tomcat on Linux Systems

 Running PHP Scripts on Linux Systems

 Running MySQL Database Server on Linux Systems

 Running Python Scripts on Linux Systems

 Conda - Environment and Package Manager

 GCC - C/C++ Compiler

 OpenJDK - Open-Source JDK

 Graphics Environments on Linux

SquirrelMail - Webmail in PHP

SquirrelMail Webmail Installation on CentOS

 SquirrelMail Configuration on CentOS

 SquirrelMail for Mail Server on Local Network

 SquirrelMail Configuration for IMAPS Port 993

 Provide Self Signed Certificate to SquirrelMail

 SquirrelMail Configuration for SMTPS Port 465

 SquirrelMail Configuration for QQ Mail

 Tools and Utilities


 Full Version in PDF/EPUB