Email messages won't download on Mac Pro but do download on iPhone.

Email messages won't download to Mac Pro but do download on iPhone 5. I've made no changes in the settings on added any updates, etc. When I "check for new mail" I hear an ping - a tone I normally don't get but no messages appear. Thanks in advance for an help you can give.

I had to call Apple Support for resolution. I'm not entirely clear on the origin of the problem but it seems that the server name(s) for Apple Mail were changed by Yahoo. It took a considerable time to correct but a senior advisor at Apple pulled it through.
Thank you all for your suggestions.

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