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Exchange Hybrid : restrict IP from Microsoft
Hello, We currently have various clients that are in hybrid mode with Exchange servers. In order to limit hacking by Exploit, we have limited external access to the Microsoft IP on port 443 and 2...
If you're running Exchange Server 2019, you can shutdown your last exchange server and continue to use the Exchange Management tools to manage your recipients.
You will first need to verify that nothing is using your local Exchange Server anymore. No multi functionals that use your server for sending email and no other services that relay email through your local Exchange server. When you're absolutely sure that that's the case, you can shutdown the last Exchange Server.
Note: Do not uninstall Exchange.
For the detailed procedure and requirements go https://learn.microsoft.com/en-gb/Exchange/manage-hybrid-exchange-recipients-with-management-tools
Regards,
Ruud