If you try a full crawler on the sharepoint server and got the message "paused by system" try to:
1.) Index Reset the index via (Index Reset) on the right side
2.) Start a Full Crawl again
How to fix “The program can’t start because MSVCR110.dll is missing from your computer.” error on Windows
[RESOLVED] You do not have the permission to send the message on behalf of the specified user
[RESOLVED] Exchange 2013/2016 hub transport Mail.que file large in size
[RESOLVED] The Open Procedure for service XXX in DLL "C:\Windows\System32\XXX.dll" failed. Performance data for this service will not be available. The first four bytes (DWORD) of the Data section contains the error code
[RESOLVED] 'Microsoft Exchange Notifications Broker' as stopped and giving a red error in the dashboard