

You can update Mail by updating your macOS (About This Mac > Software Update) - but it might take a while. It’s very common that Mail quits unexpectedly on Mac because it’s outdated or incompatible with the current macOS system. If it doesn’t work, you can re-enable the account and proceed with further troubleshooting. Now that you’ve disabled one of the accounts, go back to Mail and check if it’s working better now.

Open System Preferences and choose Internet Accounts.Luckily, there’s a handy shortcut for disabling and re-enabling email accounts, which could potentially fix the issue of Mail quitting. There could be a problem with one of your email accounts, not the Mail app per se. Because it refreshes your email list, it can prevent Mail quitting. It’s also been known as an effective troubleshooting method for the Apple Mail quits unexpectedly issue. Rebuilding mailboxes is essentially used to retrieve all your emails and attachments from the mail server.
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This is a great tip for those who can still access their Mail app after quitting. Maybe you’ve accidentally downloaded a malicious file or program to your Mac.

