Forum Discussion
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...
As long as you are using a hybrid setup, you'll need to have all MS Ports and IPs whitelisted.
Since Microsoft is not hacking you, there is no reason to restrict their access.
Learn more here:
https://www.alitajran.com/exchange-firewall-ports-for-mail-flow-and-clients/
https://learn.microsoft.com/en-us/exchange/hybrid-deployment-prerequisites
Best regards,
Schnittlauch
"First, No system is safe. Second, Aim for the impossible. Third, no Backup, no Mercy" - Schnittlauch
My answer helped you? Don't forget to leave a like. Also mark the answer as solved when your problem is solved. 🙂