VERIFIED SOLUTION i
We are no longer able to run ‘SFTP service’ and ‘Bundler service’ on bundler server. Both services are failing to start with no error messages in log files. The only info I was able to acquire is the error log from System.evtx. It says that: A timeout was reached (30000 milliseconds) while waiting for the P/I OfficeMail Bundler Service service to connect.
Local system environment - missing .NET component
ResolutionUPDATED: July 26, 2018
Reinstalling .NET framewrok, SFTP and Bundler services have fixed the issue. Please make sure that correct .NET version is installed, 3.5 for Officeamil v3.9, .NET 4.5.2 for Officemail v4