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In our organization, we have over 1,000 iOS devices that are supervised and have a global proxy set to run through our HTTP proxy server (which is doing content filtering).In iOS 12.4.1 or lower, the Mail app works exactly as you'd expect a mail app to work. However, in iOS 13, the Mail app can no longer get mail. The status bar at the bottom simply says "Connecting..." when trying to fetch new messages. If an email account is removed from the device, attempts to set the account back up (Gmail or iCloud in my case) experience a time out error when trying to submit account credentials during setup.Third-party mail applications (Spark, Outlook, and Airmail tested so far) work just fine with the same accounts that fail to work in the iOS Mail app.Has anyone else experienced issues with this? I filed a bug report back in beta 2, and it's still an issue as of beta 9 ("iOS 13.1 beta" supposedly). Feedback Assistant states that Apple hasn't gotten any other reports on this issue, although I find that a bit hard to believe, even with Global Proxy implementation being a bit of an edge case it seems.Getting a bit nervous with an iOS 13 public release coming up soon and not having a resolution to the problem. I don't relish the thought of having over 1,000 users needing to download 3rd-party mail clients to check their emails.