What are the different message classes of an archived email?? I have found two as of now:
My objective is to identify mails that can be accessed by the owner only(After authentication)
Are you looking or this?
You can also see his if you go to File -> Options -> Advanced -> Custom Forms (Button) -> Manage Forms (button)
That will list all the different custom forms and tell you the message class.
Knowing the message class won't determine who can or cannot access it though, as you may have a user that sets up delegate access where the delegates could open the items, either through Search or via the shortcuts etc
IPM.Note.EnterpriseVault.Shortcut - Email with this message clas can be access only by the owner or the account which will have permisison on the Arvhive where this message is sitting
Technically when message is converted to shortcut it wold have message class as IPM.Note.Enterprise Vault.Shortcut, and while emails are in archiving process it would pass through certain message class and finally it will be converted to said message class