Hey everyone! I wanted to see if anyone has noticed Outlook for Android potentially proxying email through the Microsoft cloud? We have an on-prem Exchange server that's behind a firewall, and I've spotted some odd activity in our logs. Several users have been authenticating through ActiveSync from the same public IP address, which appears to belong to Microsoft. Interestingly, we don't use any Microsoft 365 services. I set up Outlook for Android myself, and I noticed my inbox is also syncing from this Microsoft IP. Has anyone found any official documentation on this?
1 Answer
Yeah, this has been happening for quite a while—at least five years from what I've seen. There's a recent article discussing it that might shed some light on the issue. Check it out!
That's strange! I can't seem to find any option to opt out either. If we can't disable this, we might have to consider blocking the app for users, especially since we operate in a regulated industry.