Shows how to install the CAPTCHA SquirrelMail plugin by Paul Lesniewski. A CAPTCHA input is placed on the login screen to detect whether or not a human is attempting to log in.
CAPTCHA stands for Completely Automated Public Turing to tell Computers from Humans Apart. It helps prevent automated login attacks.
2. Download CAPTCHA 1.1 from the SquirrelMail site. If your version of SquirrelMail is not 1.5.2+ or 1.4.10+, download Compatibility 2.0.11.
4. From a Terminal window, type in /usr/share/squirrelmail/config/conf.pl and press Enter. This will launch the SquirrelMail Configuration utility.
6. Install the captcha plugin by typing in the number corresponding to it and press Enter. When you are done, type in q and press Enter to quit then type in y and press Enter to save your changes.
7. Install php-gd by typing in yum install php-gd. PHP-GD is required by almost all captcha backends.
8. In the /usr/share/squirrelmail/plugins/captcha directory, copy the file config.sample.php and save it as config.php. Edit config.php and assign a value to $captcha_backend.
patch -p0 <> Replace 1.4.8 with your SquirrelMail version.
10. Restart the httpd service. Learn how to start and stop services here.