For some reason if you want to disable Horde, or other webmail applications for user accounts who don’t want to use them.
You can follow the steps given below :

For eg.. if you want to disable Horde, neomail and want to enable just Squirrelmail for a user with username is mark, then you will have to SSH into your linux dedicated server as root, use your favorite editor vi, and edit the file:  /var/cpanel/users/mark

As we want to disable all webmail applications and just want to enable squirrelmail, you will have to add following lines:

skiphorde=1
skipsqmail=0
skipneomail=1
save the file and restart cPanel, using following command :
/etc/init.d/cpanel restart

Once you fire above command only squirrelmail would be enable for that particular user.
Now, when the user mark logs into webmail, he will get Squirrelmail as default webmail application and other two option would be disable for him.
You should have root access to your server if you want to set such feature for your users.

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