Your hosting provider has not enabled any Webmail clients

Symptoms

Attempting to access Webmail results in a 404 error or the following error:

CONFIG_TEXT: Your hosting provider has not enabled any Webmail clients.

Cause

Roundcube is disabled.

Resolution

1. Log in to WHM as the root user
2. Navigate to Home / Server Configuration /
   Tweak Settings
3. Click on the Mail tab
4. Set Enable Roundcube webmail to On
5. Click the Save button

If Roundcube is still inaccessible after enabling it in Tweak Settings or if it was already enabled there, it may be disabled in the /var/cpanel/rpm.versions.d/local.versions file. To enable it there:

1. Log in to the server via SSH or WHM's Terminal as the root user

2. Enable Roundcube:

   # /usr/local/cpanel/scripts/update_local_rpm_versions --del target_settings.roundcube

3. Install Roundcube:

   # /scripts/check_cpanel_pkgs --fix

Additional Resources

How to Override the rpm.versions System | cPanel & WHM Documentation