How can you add Roundcube (or any other php webmail client script) to the WordPress backend? Can this be done so that the webmail client can be accessed only from inside wp-admin? I.e. it should not be accessible from any URL outside of wp-admin.
Where must the webmail client be installed on the webserver? If it’s installed for example at /webmail it could also be accessed through
https://server.com/webmail, which is something I’d like to avoid.
Please note that single sign on/off is not needed. The only thing that’s required is to hide the webmail script behind WordPress admin.
How would you do this? Your advise is highly appreciated. Thank you.