Apple, Microsoft Working to Fix iOS 11 Mail App Issues With Outlook.com, Office 365 & Exchange Accounts

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Apple says it is working closely with Microsoft to fix an issue that prevents Outlook.com, Office 365, and Exchange 2016 account holders from sending or replying to emails using Apple's native Mail app in iOS 11.

Apple published a support document on Tuesday, September 19 - the official launch date of iOS 11 - to acknowledge the issue affecting users of Microsoft email servers.


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".

Both companies' statements suggest they were caught off guard by the Mail app problem in iOS 11, however MacRumors is aware of several users who installed beta builds of the mobile operating system and flagged the issue with Apple as far back as July.
1/2 I've sent bug reports to @Apple during #iOS11 testing that mail cant be sent through native email app using exchange-same on #iOS11GM - Lt. Andy Norris (@LtAndyNorris) September 12, 2017
2/2- Have you heard any reports of not being able to send mail using exchange on native email app? It works on Outlook app just fine. #iOS11 - Lt. Andy Norris (@LtAndyNorris) September 12, 2017

Despite apparently being aware of the problems for some time, both Apple and Microsoft said they are still working together to resolve the issue. Apple added that it would release a fix soon in an upcoming software update, while Microsoft offered the following workaround in the meantime.
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.
Stay tuned to MacRumors to find out as soon as Apple releases a fix for the ongoing Microsoft server issues in iOS 11.

Article Link: Apple, Microsoft Working to Fix iOS 11 Mail App Issues With Outlook.com, Office 365 & Exchange Accounts
 

M.PaulCezanne

macrumors 6502a
Mar 5, 2014
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MS :mad:

(I know this one's on Apple, it's just a general point I felt like making here)
 
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chrmahr

macrumors newbie
Sep 20, 2017
1
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I reported the bug myself... and there are others as well.
1. If you want to delete a mail via lockscreen und 3d touch, the notification disappeary but the email is not deleted.
2. Calendar Invitations are also buggy as hell
 
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mporcheron

macrumors member
Nov 13, 2011
73
145
Nottingham, UK
This has been happening for a while for me too on the betas. If you go to the Outbox and try to send the mail again, it works on second or third attempt for me.

Oddly, email-based calendar notifications over Exchange don’t have a problem
 

RamGuy

macrumors 6502a
Jun 7, 2011
903
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Norway
Hmm, I can reply and send using Office 365 for Business aka Hosted-Exchange using the Mail.app? I suppose Microsoft will use this as a opportunity to promote the Outlook.app.. :p
 

coolfactor

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Jul 29, 2002
4,295
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Vancouver, BC
I could have sworn I saw people complaining about this during the betas. Now, 3 months later and GM released they’re talking about fixing it?
No kidding, eh? For such high-profile companies, this really is inexcusable. Someone is not playing by the rules and following specs closely enough. But which one?

I suppose Microsoft will use this as a opportunity to promote the Outlook.app.. :p
They already are. Not surprising.
 

iosuser

macrumors 6502a
Mar 12, 2012
925
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I have no problem sending. Installed it on all my i-devices the moment it went live.

I never installed the beta, if that's the differentiating factor.
 
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RSmith2023

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Sep 26, 2015
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Atlanta, GA



Apple says it is working closely with Microsoft to fix an issue that prevents Outlook.com, Office 365, and Exchange 2016 account holders from sending or replying to emails using Apple's native Mail app in iOS 11.

Apple published a support document on Tuesday, September 19 - the official launch date of iOS 11 - to acknowledge the issue affecting users of Microsoft email servers.


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".

Both companies' statements suggest they were caught off guard by the Mail app problem in iOS 11, however MacRumors is aware of several users who installed beta builds of the mobile operating system and flagged the issue with Apple as far back as July.


Despite apparently being aware of the problems for some time, both Apple and Microsoft said they are still working together to resolve the issue. Apple added that it would release a fix soon in an upcoming software update, while Microsoft offered the following workaround in the meantime.
Stay tuned to MacRumors to find out as soon as Apple releases a fix for the ongoing Microsoft server issues in iOS 11.

Article Link: Apple, Microsoft Working to Fix iOS 11 Mail App Issues With Outlook.com, Office 365 & Exchange Accounts
Problem with the Microsoft workaround occurs when your company’s security policy blocks the use of the Outlook app because it sends the authentications through 3rd party servers. This is the case where I work. Luckily we are still on Exchange 2013 for now and I can use apple’s mail app.

It’s stunning that both Apple and Microsoft ignored this throughout the betas after being informed. (That is the whole point of the beta process, right?)
 

JosephAW

macrumors 68020
May 14, 2012
2,395
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This is up there with the removal of the AppStore in iTunes. From Mr. Cook's point of view this is a small problem. He probably said, who uses Microsoft products anymore just as he said, who uses the AppStore on the desktop. Both low percentages in his mind.
 

klunernet

macrumors member
Jul 14, 2011
44
120
Hoorn, NL
Using the outlook app on iOS is a massive privacy / security issue and violation of rules where I work. It stores your email on Microsoft cloud servers, even if you use a on-premis exchange server.
 
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esposimi

macrumors member
Feb 18, 2008
47
3
Tested on an iPad Air with iOS 11 and did not have any issues sending, receiving, or replying using the built in mail app. My organization uses Exchange 2016.
 

srminton

macrumors regular
Sep 5, 2008
113
133
Hmm, I can reply and send using Office 365 for Business aka Hosted-Exchange using the Mail.app? I suppose Microsoft will use this as a opportunity to promote the Outlook.app.. :p
Yeah, no problems for me here either. Not sure why I'm not affected, as I'm also using Office 365-hosted corporate email on Mail.app and it's working fine. Actually it's working better than iOS 10, because it has fixed a bug where text would be too small to read on my phone (something to do with HTML, apparently). Now emails are displaying perfectly, and I can send/reply to emails fine too.

I do use the Outlook app for some things, but I prefer Mail.app for quickly scanning email (and because it's the default email app when clicking links). What I really like in iOS 11 is that when I drag an email from Mail.app on my iPad to another app like Notes, Evernote or Things, it creates a link back to the email. This is a killer feature for me, which will keep me on Mail.app.
 

mluczkowski

macrumors newbie
May 31, 2017
5
0
Been working fine for me. I use O365 with my own domain hosted on it. Been using iOS 11 since the first beta and have the release installed as well.