Mail stuck in "copying messages" - solved

About a week ago I got the problem where Mail is stuck in "Copying messages". Not only does this run the processor out of control, but it also means any changes you make in MacOS Mail are not reflected in Mail on your iOS devices.


Support's suggestions - reboot, update software, safe mode, try a new user account - do not have any impact, so it can be frustrating to debug.


Here is how I solved it. I have a lot of accounts that my MacOS Mail checks, mostly Gmail accounts and two iCloud accounts. Using Mail > Preferences > Accounts, I went through one by one, unchecking the "Enable this account" button then quitting and relaunching Mail, until it finally launched without the "Copying messages" status. This is how I identified which account was causing the problem. In this case, it was a Gmail account, and fortunately that account is thoroughly archived online.


Delete the account. Make sure you're actually deleting it and not just disabling it on this device. Then I re-added it, and everything was fine.


I hope this works for you too!

iMac 27″ 5K, macOS 10.15

Posted on Aug 1, 2020 6:57 AM

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Posted on Dec 19, 2020 5:55 AM

I also have this problem periodically, usually when copying messages to gmail.


Instead of deleting the problematic gmail account, simply disabling it (Preferences -> Accounts -> [gmail account] -> uncheck 'Enable this account'), quitting Mail.app, reopening Mail.app, and re-enabling the gmail account solves the problem for me. This has the advantage of not needing to download all of the messages from gmail as is necessary if you delete the account entirely.


Cheers!

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Sep 18, 2020 8:44 AM in response to tonopimentel

Well. It worked! Hallelujah!


Today I had been reading differing views around the web about whether deleting an imap account on a mac would or would not result in the messages downloading to the mac inbox again I was, as you know, reluctant to chance deleting the account with 20k emails in its inbox.


So I thought I would export the relevant inbox to my desktop, and import it back to Mail as a backup. But that resulted in an INBOX.partial mailbox in On My Mac which only contained the most recent 4k of the 20k emails.


Having then read numerous (and often opposing) thoughts about why this had happened, and what to do about it, I thought sod it. There's only so much a man can take. And I do have a Time Machine backup (though no doubt that would have brought its own issues).


So I deleted the imap account as you outlined, closed mail, rebooted the mac, restarted Mail and took a deep breath.


And it worked. All the 20k emails came pouring back into the new inbox.


And the Copying Messages message has gone!


Hallelujah. Well done Antonio. What a man!





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Mail stuck in "copying messages" - solved

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