Its been some time that administrators wanted a tool similar to the Exchange Remote connectivity Analyzer (EXRCA) to check for connectivity issues internally within their environment. Well, guess what? There is one available now, ready for you to download. Its called the Microsoft Connectivity Analyzer (MCA).
Please check the official product team's announcement here:
A point worth mentioning. This tool goes along with the already existing Microsoft Exchange Remote Connectivity Analyzer (EXRCA) which is also celebrating a new version release V2.1.