A flaw in iOS 11 that left some users of Microsoft email unable to send messages has been fixed, the companies said.

Email accounts hosted by Microsoft on Outlook.com, Office 365, or an Exchange Server 2016 running on Windows Server 2016 were affected by the software glitch.

Some users of mobile devices running iOS 11 have been receiving error messages that read: "Cannot Send Mail. The message was rejected by the server."

The problem was noted by Apple iOS 11 users in a post on Reddit.com.

On Sept. 19, Apple published a support document stating it was working with Microsoft to fix the issue, which was described as iOS 11 not being able to successfully create an HTTP/2 Transport Layer Security connection; that kept it from connecting to email clients and prohibited outgoing email from being delivered.

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