1. Go to system preferences and click [Internet Accounts]

2. Click the [+] symbol, and then [Add other accounts] 3.Enter your name, email address and password then click [Sign in] 4. At this point you will most likely get the error “Unable to verify account name or password”, fill in the rest of your details and click [Sign In] again. 5.  Click [Done] 6 Return to Mail, and select [Mail] [Preferences] 7 Open the [Server Settings] tab. 8 Uncheck “Automatically manage connection settings” then set the port to “465” and the authentication type to “Password” then click [Save] 9 Once verified you should be able to send and receive email.