We’ve been hearing about this from our users today, and thought some of the rest of you may see the same problem: the Mail app in iOS 11 cannot reply or send new email through Office 365 or Exchange 2016. This looks like it’s an Apple problem, and one they’re going to need to patch. I’ve been using the Outlook app which, of course, works just fine. This is the first major issue I’ve heard of with iOS 11 but IMO it’s a biggie.
https://support.microsoft.com/en-us/help/4043473/you-can-t-send-or-reply-from-outlook-com-office-365-or-exchange-2016-i
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