You can't send or reply email from, Office 365, or Exchange in iOS 11.0 Mail app

Applies to: Exchange Server 2016 Standard EditionExchange Server 2016 Enterprise EditionExchange Online


In the native Mail app ( on your iPhone or iPad, you can't send or reply from your, Office 365, or Exchange Server 2016 email account after you upgrade to iOS 11.0.

Note These issues don’t occur in iOS 10.x.


This issue occurs because the Mail app on iOS 11.0 is incompatible with, Office 365, and Exchange Server 2016 running on Windows Server 2016.


To resolve this issue, update your device to iOS 11.0.1 or a later version. 


For more information about this issue, see this Apple support website.