Mail unusable since upgrade to Sierra

I'm also having same Mail app crashing issue after updating my OS to the latest Sierra version.

Need help.

Hi

This worked for me thank you!

Mermaidk8

Thanks for bringing this up. I've been having the same problem every since I updated to the new operating system. I temporarily solved the problem by disabling my yahoo account. Now when I click on another IMAP account, or the Sent folder, it crashes. I've tried all the suggested solutions here. The Sent folder crash is the last straw, though. I'm constantly needing access to sent emails.

The frustrating thing is that this is an Apple product, an integral link in the chain of apps, and the whole Apple "all you need is us" paradigm, and no one from Apple seems to care. As of today, I'm bailing from Apple Mail. I'll suffer at first because Apple makes it hard to integrate anything but their own products. But this is a serious fail with Mail on their part. It's now worse than some beta applications out there I've tried.

Keep us informed if you find a solution.

If you're also crashing in Address Book, that could very well be your problem. Try moving the ~/Library/Application Support/AddressBook folder to your desktop and/or delete it and see if that makes a difference.

Good luck!

Thanks, Sharkwood. This may have fixed my problem, as well. Is it safe to delete the Address Book folder? Or will I lose data for my Contacts?

Thanks,

Buffy

I do believe you'll lose your Contact info, but you'll still have the auto-addressing in Mail. The Contacts on the Mac that I deleted had very little in it anyway, so no great loss on my part. Those common addresses that you use regularly will still appear in Mail as you start to enter them in a new email. If your Contacts can be opened without crashing, do an export of your contacts, remove the folder mentioned above, and retry Mail. If all goes well, import your contacts back into the address book and see if Mail behaves itself. If it crashes again, then you have something corrupt in the address book and may have to let it go. I'm not sure how Mail and Contacts interact, but it seems a bit more complicated than it needs to be.

Cheers!

I faced the same problem after an "erase and re-install" of OS 10.12.1 meant to solve the Finder becoming unresponsive. The "erase and re-install" solved the Finder issue but Mail.app stop working. I was on the phone with Apple support and the suggested a "safe reboot" that didn't solve the issue. While waiting on hold for a support supervisor I tried the following: System Preferences -> Internet Accounts: uncheck Mail in every one of my ten accounts. Then tried to launch Mail.app again, it opened and began to import my 839.482 messages (because of the "erase and re-install" I had to recover my data from Time Machine). After Mail.app finished importing the messages: System Preferences -> Internet Accounts, re-checked Mail in all my accounts. Now Mail.app is working again.

Same problem here; mail quits when attempting to open sent folder. Attempted to try Sharkwood's fix (although I have not had any issues with Address Book) but there is no AddressBook folder in my /Library/Application Support/ folder. Any ideas? This has been an issue with Sierra for months and is beyond a nuisance and should be addressed by apple asap. Thanks in advance for any help...

So far has taken 5 days to get nowear with apple support . great upgrade with no email or messages

On Sierra in beta and currently updated fully. As I am typing this just after the previous period, this:

This started happening about a week ago. Since, I have been testing options. I've done this before as Mail.app was flaking some time ago. Found a fix. This particular issue does not seem repairable at user level OR my level of expertise. Tried NVRAM, SCM resets, deleting various folders in the library and container as instructed by various websites.

Currently, Airmail 3 is great. Polymail not sufficient because it seems to not handle pop and cannot change a particular account from pop to imap. Nylas N1 either requires what I believe is a too high subscription ($84 per year) OR an open source option that requires running virtual box to run the Nylas Sync Engine on a server. Boxy is gmail only. Pop account causes issues with other options.

Good luck folks.

Thats what was wrong with mine , Apple found it after trying most of the other things, now works fine .

I had a similar problem. In my case Mail would not open at all. It simply went to Not Responding after a few seconds and no windows opened at all. I tried all the solution listed here. What ended up working was to remove the entire Mail file from the Library folder. This immediately solved the problem. Mail then re downloaded all the messages and rebuilt that file.