Afterlogic WebMail Lite 8 is an open-source webmail script for your existing IMAP server, Plesk or cPanel.
This API allows applications to communicate with backend code of Afterlogic WebMail Lite . You can create your custom frontend which would interact with Afterlogic WebMail Lite backend via Web API. Note that the application which uses Web API doesn't have to be written in JavaScript, it doesn't even have to be a web application, you can use this API in mobile, desktop and server applications as well.