HT204173: Use Mail Connection Doctor
Learn about Use Mail Connection Doctor
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Helpful answers
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Oct 2, 2015 7:17 PM in response to barryfromcornwallby leroydouglas,I would re-install the OS on top of your existing. User files should remain untouched. There is no stand alone Mail.app installer
Always have a current backup plan in place.
Recovery http://support.apple.com/kb/HT4718