Suddenly can no longer receive Yahoo IMAP in Mail

I have suddenly become unable to receive Yahoo IMAP mail in my Mail client in Yosemite on my MacBook Pro (13"  Early 2011).
I can send mail, but not receive it. I suspect a problem on the Apple/OS X side, because my iOS devices are still receiving Yahoo IMAP mail.
I tried deleting and re-adding my Yahoo account. Now, not only can't I receive mail, I can't see any mail in my Inbox! Yet, I can see all my Yahoo folders and their contents while using Mail.

Hello Paul,
Thank you for participating in the Apple Support Communities.
It does seem like you're encountering an issue with email that's isolated to your Yahoo IMAP account in Mac OS X.
For a situation like this, start with the troubleshooting tips in the section of this article called "Mail Connection Doctor shows one or more red dots in the account Status column:"
OS X Mail: Troubleshooting sending and receiving email messages
This article contains a variety of steps that can help resolve an issue like the one you're seeing.
All the best,
Jeremy

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