Apple released iOS 11 few hours earlier with several new features. However, users have complained that there has been some issues with Apple’s native mail app as users of Outlook.com, Office 365, and Exchange 2016 couldn’t reply or send emails using the application. Apple however, has acknowledged the issue and released a support document on September 19.
The official support document notes,
“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.”
Following the note, Microsoft also released a support note saying that the company’s mail application is not compatible with outlook servers.
While both of the companies weren’t prepared for the issue, the tech giants are working together to fix the issue. Apple has said that it will announce a release soon. However, if you are using the application as the primary email application, Microsoft has announced a workaround to fix the problem. The note says, “To work around this issue, download the free Outlook for iOS client from the App Store. The Outlook for iOS client fully supports various email services, including Outlook.com, Office 365, and Exchange Server 2016.
If you use the Mail app to sync data from Exchange Server 2016 that is running on Windows Server 2016, you can ask the system administrator to disable HTTP/2 in Windows Server 2016 as a workaround. The instructions on disabling HTTP/2 can be found in the Workaround section of KB 4032720: How to deploy custom cipher suite ordering in Windows Server 2016.”
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