A Remote Connectivity Analyzer site is available to test connectivity to Exchange Server.
As per Website:
“This tool is simply a Prototype of an idea regarding new ways for customers to test connectivity in their Microsoft Exchange Server environments. This tool is made available for public use as-is with no warranties expressed or implied. This tool can be used for testing purposes or entertainment value and is not supported by Microsoft Product Support in any way.
While no passwords are stored or cached and all activity are transmitted to this site over a secure channel, you are strongly encouraged to only use test accounts to limit any possibility of unwanted information disclosure. “
This site is definitely much appreciated and would really help Administrators – https://www.testexchangeconnectivity.com/