You are providing the email or display name which is too short for exchange server.
Well the error was thrown by Exchange side not our code, we manipulate the code errors and make them as friendly as required.
The errors thrown by providers are shown exactly as they are, because it would be easy for us as developers and for you as an Admin to find a solution from the provider itself or the forums or any other resources.
Hope you got my point.
Thanks
Shahid Mehboob
Lead Software Engineer
www.machsol.com