How to change the default webmail client via the CLI

Introduction

The default webmail client for an email account may be set from the command line.

Procedure

1. Access the command line as the 'root' user via SSH or "Terminal" in WHM.
2. Run the following command.
   

   echo '{"personalization":{"user@domain.tld_default_webmail_app": "roundcube"}}' | uapi --input=json --user=cpaneluser Personalization set

   Please note that user@domain.tld and cpaneluser must be replaced by the email address and cPanel account user, respectively, of the account that will have the default webmail client changed.