Mail (Yosemite): Use Connection Doctor
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Choose Window > Connection Doctor.
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Review the status information, then try to resolve any problems.
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Check your Internet connection: If Connection Status shows a red dot, Mail can’t connect to the Internet. Click Network Diagnostics for help in solving the problem.
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Check your email accounts: If an account shows a red status dot (when you’re connected to the Internet) there may be a problem with the account provider’s mail server, or your account setup. Follow the instructions shown in the Details column. To see the account in the Accounts pane of Mail preferences, double-click the text in the Details column.
To see log information while Mail tries to connect, click Show Detail, then click Check Again.
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When you’re done, click Check Again to see if your actions resolved the problem.
If the problem persists, contact your account provider to verify your account details and setup.
If you contact Apple Support with Mail issues, you may be asked to select the Log Connection Activity checkbox. When selected, diagnostic information is collected while you use Mail, to help Apple Support understand and resolve Mail issues, investigate issues with your computer, and help improve Apple products and services. The diagnostic information collected might contain personal information, including the content of your email messages. If sent to Apple, this information is used by Apple in accordance with its privacy policy and is not shared with any other company.
To see the folder of log files in Finder, click Show Logs. After you provide log files to Apple Support, deselect the checkbox to turn off connection activity logging. You may want to delete the log files, as they can be large.
Learn more about the Apple Privacy Policy at www.apple.com/privacy.