Change Default Webmail
Customers often ask us if they can change the default webmail client. On our current DirectAdmin-based systems there are no default email clients, you are welcome to use any that you like at any time. However, if you are using a custom webmail domain as instructed by this tutorial, these point directly to Roundcube and that cannot be changed. However, consider that you can alternatively (or additionally) use Crossbox on any URL that you choose.