Mail Preference keeps changing since High Sierra Update

Since the update to High Sierra, a Preference I set in Mail keeps changing itself.


I prefer the Classic Layout which is chosen from Mail > Preferences > Viewing and this takes effect correctly when I set the Preference, but it keeps dropping out every third or fourth launch so Mail reverts to the modern layout. Anybody else seeing this?

iMac (27-inch, Late 2012), macOS Sierra (10.12.6)

Posted on Oct 8, 2017 7:00 AM

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Posted on Jan 3, 2018 11:03 AM

I finally resolved this on my own. I had to delete the correct preferences file. It is here:


/Users/{your username}/Library/Containers/com.apple.mail


It is actually a folder. This seems to be the modern method Apple uses for preferences.

72 replies

Nov 9, 2017 7:43 AM in response to JJGraphics

Ok, so I'm not alone. Had this happening to me since upgrading to High Sierra, and again this morning it switched from Classic Layout to the modern one. I'm currently running macOS 10.13.1 with all the patches, so I know it's not an issue of needing to update.


Apple, for heavens sake, please fix this. For those of us who use your mail client, it's beyond annoying. What is happening to the QC at Apple??

Nov 16, 2017 2:14 PM in response to JJGraphics

I will add myself to the list of people that are experiencing the same problem. I have a mid 2011 iMac and had no problems until the upgrade to High Sierra. It is so sad that Apple is now releasing software the same way Microsoft does, full of bugs and things that instead of enhancing the user experience are making it worse. The same thing happened with the latest version of IOS 11 and HomeSharing, it doesn't work properly and there is no fix in sight. At this rate, it will make more sense to buy Microsoft products. They may not be as good and they are more prone to viruses but for the average user like me, it will be cheaper and easier in the longrun

Nov 17, 2017 1:57 AM in response to JJGraphics

As a user who pays to buy his products the same way you do and who uses both Apple and Microsoft products at a federal government institution, I reserve the right to express my comments in any way I see fit. The purpose of the thread remains the same, otherwise I would not have mentioned I have the same issue, the same way I have issues with IOS 11 (which have yet to be resolved). Please refrain from telling me what I can and cannot say. Thank you

Nov 21, 2017 2:20 PM in response to LRDiscovery

Hey, thanks for the suggestion. I was looking for an email client that was good and cheap and Thunderbird sounds like a great option. It's extremely sad that something as simple and as basic as the main email application from Apple is not working properly after the latest OS release. My preferences keep resetting to the default and even the message viewing window changes when I open the Mail app. It's irritating and even if it's not something that will keep the computer from working it certainly makes me not even want to check my email.

Dec 3, 2017 4:13 AM in response to JJGraphics

Indeed it does it to me too. I much prefer the classic layout but seems I am getting the same symptoms. I would launch mail and the layout would be the modern version with the content window squashed way over to the right of the window. I close and re-launch and it seems to be back to classic without having changed anything except the lower content window in this layout is all squashed to the bottom - nothing that re-stretching the horizontal toggle bar doesn't solve, but this bug is very annoying!

Dec 11, 2017 5:20 PM in response to anne1pete

The 10.13.2 update is supposed to appear in the update tab of App Store as long as the Mac meets the following High Sierra's system requirement, I guess. Which Mac model are you using ?


General Requirements

OS X 10.8 or later

2GB of memory

14.3GB of available storage to perform upgrade*

Some features require an Apple ID; terms apply.

Some features require a compatible Internet service provider; fees may apply.


Mac Hardware Requirements

For details about your Mac model, click the Apple icon at the top left of your screen, choose About This Mac. These Mac models are compatible with macOS High Sierra:

MacBook (Late 2009 or newer)

MacBook Pro (Mid 2010 or newer)

MacBook Air (Late 2010 or newer)

Mac mini (Mid 2010 or newer)

iMac (Late 2009 or newer)

Mac Pro (Mid 2010 or newer)

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Mail Preference keeps changing since High Sierra Update

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