Exchange validation
[-] exchange mailbox validation failed, code: MailboxUnreacheable
CONFIGURATION INVALID
Open up
C:\ProgramData\Mimecast Synchronisation Engine\State
Create global.ini file
On the first line enter
Mse.Core.Bridge.SecurityProtocol=4032
Save , restart the Mimecast Synchronisation Service , and try again
How to turn on verbose login
Mse.Ews.Soap.Spy=true
Mse.Core.Soap.Spy=true
Mse.Core.LogLevel=All
Mse.Core.Soap.Spy=true
Mse.Core.LogLevel=All