SquirrelMail is an open source standards-based webmail package written in PHP. When installed, SquirrelMail is ready out of the box. All it needs is an installed web server like Apache, SMTP server like Postfix, and IMAP server like Dovecot.
2. Install squirrelmail using the command below. 
3. Start the httpd service. Learn how to start and stop services here.
1. Launch the SquirrelMail Configuration utility using the command below. 
If your Terminal window has a white background, make sure that the colors are off by looking for the command Turn color on. If the command is Turn color off, type in C and press Enter to turn the colors off. This will ensure that you will be able to read all of the text.
2. Type in D and press Enter to select the Set pre-defined settings for specific IMAP servers menu. Type in dovecot and press Enter.
3. Type in 2 and press Enter to select the Server Settings menu.
4. Type in 1 and press Enter to select the Domain menu. Type in your domain name and press Enter. Save your changes and quit when you are done.
5. Type the commands below to enable SquirrelMail to function properly under SELinux.I recommend installing the Retrieve User Data plugin so the user’s name will appear whenever he or she sends an email in SquirrelMail.
1. Click the browser icon at the top near the System menu to launch the Firefox web browser.
2. In the address box, type in http://localhost/webmail/src/configtest.php and press Enter. Check for any errors.
3. In the address box, type in http://localhost/webmail and press Enter. Type in a valid username and password and click Login.
3. That’s it, it’s working.If you encounter any problems, check the log file at /var/log/maillog.
If you are using SSL and you want to force users to use SSL, add the Redirect directive inside the VirtualHost section to redirect browsers to the secured version. See the example below.2. Restart the httpd service. Learn how to restart services here.
3. Now try browsing http://localhost
Installing SquirrelMail
2. Install squirrelmail using the command below. yum install squirrelmail
3. Start the httpd service. Learn how to start and stop services here.Configuring SquirrelMail
1. Launch the SquirrelMail Configuration utility using the command below. /usr/share/squirrelmail/config/conf.pl
If your Terminal window has a white background, make sure that the colors are off by looking for the command Turn color on. If the command is Turn color off, type in C and press Enter to turn the colors off. This will ensure that you will be able to read all of the text.
2. Type in D and press Enter to select the Set pre-defined settings for specific IMAP servers menu. Type in dovecot and press Enter.
3. Type in 2 and press Enter to select the Server Settings menu.
4. Type in 1 and press Enter to select the Domain menu. Type in your domain name and press Enter. Save your changes and quit when you are done.
5. Type the commands below to enable SquirrelMail to function properly under SELinux.setsebool httpd_can_network_connect on setsebool httpd_can_sendmail on
I recommend installing the Retrieve User Data plugin so the user’s name will appear whenever he or she sends an email in SquirrelMail.Testing SquirrelMail
1. Click the browser icon at the top near the System menu to launch the Firefox web browser.
2. In the address box, type in http://localhost/webmail/src/configtest.php and press Enter. Check for any errors.
3. In the address box, type in http://localhost/webmail and press Enter. Type in a valid username and password and click Login.
3. That’s it, it’s working.If you encounter any problems, check the log file at /var/log/maillog.Relocating SquirrelMail into the domain root
By default, SquirrelMail is located in the /webmail of your domain. If you prefer to access SquirrelMail from the root of your domain, follow the steps below.
1. Create the file /etc/httpd/conf.d/sqroot.conf containing the lines below.
<VirtualHost *:80> DocumentRoot /usr/share/squirrelmail </VirtualHost>
If you are using SSL and you want to force users to use SSL, add the Redirect directive inside the VirtualHost section to redirect browsers to the secured version. See the example below.redirect permanent / https://mail.acme.local
2. Restart the httpd service. Learn how to restart services here.
3. Now try browsing http://localhost
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