Information Technology Services Centre - (Resolved on iOS11.0.1)@Link / O365 Mail Can't Send & Reply on iOS11's Email Client
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  • [Updates] iOS 11.0.1 released by Apple has this problem solved. 

    In the native Mail app ( on your iPhone or iPad, you can't send or reply from your @Link account, Office 365 Mail account or department email account which uses Exchange Server 2016 after you upgrade to iOS 11.

    Please download Outlook app in the app store as a workaround to connect to your @Link / Office 365 Mail. For details, please refer to