mail quits immediately upon opening

Hello  Jennifer Ashton,

Thank you for using Apple Support Communities!

It is my understanding from your post that you have not been able to open the Mail app even after updating your software. Testing the issue while in safe mode and/or a new user account may be helpful in determining the cause of the issue. The following articles will provide you with steps on using safe mode and how to create a new user account to test the issue:

How to use safe mode on your Mac - Apple Support

How to test an issue in another user account on your Mac - Apple Support

Best Regards.

Jennifer Ashton wrote:

Help! Mail suddenly quits immediately if I open it. I saw that there was a system update and installed that and restarted, but I'm having the same problem, every single time. No issue with my Mac OS devices, though.

Quit mail.

From the Finder>Go>Go to Folder, copy & Paste:

 ~/Library/Containers/com.apple.mail

Highlight all the contents in this folder. Place your mouse on the selection,

Then Control click (right-click) and choose "New Folder with Selection”. Do not move the new folder from this current location.

You can close the Finder window.

The next step will be to restart the Mac and test

After the computer is restarted, open the Mail.app> to see if it opens properly.

step by step, including pics:

https://discussions.apple.com/thread/251147316?answerId=252188310022#252188310022

please post back your success or failure here...