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I am on Mac OSX Yosemite 10.10.5 and using Mail Version 8.2 (2104). This morning I opened the mail app and for some strange reason all of my accounts are not listed over there anymore.

The mail app shows No mailbox selected. Choose a mail account to add

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If I go to System Preferences/Internet Accounts the accounts are visible there:

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This is what I tried to do in order to fix:

  • Close mail app and remove an account
  • Reboot the system
  • Added the account back

I also deleted from ~/Library/Mail/V2/MailData/ the files that start with Envelope index*

  • Removed/Re-added icloud account for my mac

But none of the above worked.


Additionally if I add an email account that I never used before on my machine the mail.app crashes.

Why is this happening (is it because of an update)? How can I get this fixed?

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After chatting with apple support - apparently there was a problem with the mail.app under my main user account.

To find out what the problem was I went through this steps:

  • Removed/Re-added iCloud account

  • Removed one of my other accounts from Preferences/Internet Accounts and re-added it in mail.app

  • Copied the contents of ~/Library/Mail/V2 in another location on my HD (Rebooted afterwards)

  • Checked if the problem was also happening when the account was logged in SAFE BOOT

And after all of the above I still couldn't get it fixed.

So I created a new test account on my machine and checked if the mailboxes were synchronising within the mail.app under the new account. And soon enough I found that everything was working properly therefore, something was wrong with my primary account.

Solutions I had:

  • Create a new account and migrate everything from the old to the new but except the mail preferences

  • Update to El Capitan (Which it wasn't the most optimum choice because it was going to mess up with my Apache configurations) - Solution I eventually followed

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