This document explains how some cPanel & WHM versions update the SquirrelMail webmail application, and how you can customize your SquirrelMail installation.
You may need to perform certain steps in your webmail application in order to view folders that contain archived or Apache SpamAssassin™-filtered mail.
This document describes the horde-squirrelmail-contacts-import-plugin plugin.
This document describes the roundcube_squirrelmail_contact_import plugin.
cPanel & WHM includes the Horde and Roundcube webmail applications.