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Use safe mode to isolate issues with your Mac - If you're still facing this issue, test how it responds in safe mode.
#ADD HOTMAIL TO MAC MAIL EXCHANGE HOW TO#
How to turn on or turn off your Mac - Restart your MacBook Pro then test the issue. See if you're able to add the accounts again.
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MacOS Sierra: Quit apps - If you're not seeing a certificate issue, make certain the Mail app is completely closed, then restart the Mail app while holding down the shift key. If you're seeing this along with the error, use the steps in this article. MacOS Sierra: If your certificate isn’t being accepted - Sometimes, when this error is received, it refers to a certificate issue. Thank you for getting back to us with that information, Bearclaw97.
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Verify an account’s outgoing mail server - These steps will help verify the server. The issue is, Mail is unable to verify the identity of the outgoing server. It appears that you've added two email accounts to the Mail application on your MacBook Pro.