RESOLVED: It appears that Apple has resolved the issue with the release of iOS 11.0.1
If you are using an Apple iOS device to access Office 365 and other Microsoft mail services, do not upgrade to iOS 11 just yet. There is a problem, that existed during the beta, with using the iOS mail application to access these Microsoft mail services that is still not resolved. Sometimes a little patience will save you a ton of headache.
"If you can‘t send an email with iOS 11 and an Outlook.com or Exchange mail account You might see an error message that says "Cannot Send Mail. The message was rejected by the server." If your email account is hosted by Microsoft on Outlook.com or Office 365, or an Exchange Server 2016 running on Windows Server 2016, you might see this error message when you try to send an email with iOS 11: "Cannot Send Mail. The message was rejected by the server."
On Tuesday, Microsoft also published a support note, which states that Apple's Mail app in iOS 11 "is not compatible with Outlook.com, Office 365, or Exchange Server 2016 running on Windows Server 2016".
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