How do I list email folders and view emails using the MailEnable API?

First, obtain a `ME_VALIDATIONTOKEN` by accessing `/mewebmail/Mondo/Servlet/request.aspx?Cmd=GET-MBX-OPTIONS&Scope=2`. Then, request folder contents via `/MEWebMail/Mondo/Servlet/asyncrequest.aspx?Folder=inbox` (or other folders) with the token. The response is XML containing email IDs and brief info. To view a specific email, use `/MEWebMail/Mondo/Servlet/request.aspx` with `Folder`, `ME_VALIDATIONTOKEN`, and `ID` parameters. Details are in the MailEnable Development Guide.