Apple’s iOS 11 update is blocking Microsoft email accounts from sending messages using the default Mail app for iPhone and iPad.
While the emails from Outlook.com, Office 365 and Exchange 2016 addresses were compatible with previous versions of iOS, the software update released yesterday caused emails to fail to send.
Users trying to use a Microsoft email account on Mail have been with the message: “Cannot Send Mail. The message was rejected by the server.”
Microsoft said the iOS 11 version of Mail is not currently compatible with Windows servers. Both Apple and Microsoft said they were aware of the problem.
Microsoft advised its email users to download Microsoft Outlook from the app store, which is compatible with iOS 11, to send mail.
“Apple is working closely with Microsoft to resolve the issue and will release a fix soon in an upcoming software update,” Apple’s support page said.
Apple and Microsoft confirmed the problems on Tuesday, although several testers using the public beta version of iOS 11 had discovered similar issues, according to posts on social media.
While updating the iPhone and iPad operating systems can cause compatibility issues for some apps, this year’s problems have been limited compared to iOS 10, which caused “bricking” issues on some iPhones, where some phones are rendered virtually unusable following the update.
Users can check if old apps will work with iOS 11 in settings, as the update has left iPhones such as the iPhone 5C and 32 bit apps incompatible.
Apple’s iOS 11 was released on September 19 following the announcement of its new iPhone 8 and iPhone X smartphones last week. The software offers several major new features coming to the iPhone for the first time, such as phone-to-phone Apple Pay, a smarter Siri and a redesigned, customisable control centre.