Over the next few version updates, cPanel will deprecate and then fully remove the SquirrelMail webmail application.
SquirrelMail’s last update was May 30th, 2013, with their last full release provided on July 12, 2011. In that seven years, four versions of PHP have reached End of Life, and SquirrelMail has not kept pace with either operational or security changes.
All Webmail users should now move from the SquirrelMail interface to the much more robust Horde interface which has always been our recommended webmail application for all users.
- Montimedia team