Mail.app will not send (att) mail. Web mail and Thunderbird can send.

Mail.app will not send (att) mail. Web mail and Thunderbird can send.

I'm having the exact same problem on my iMac. I can receive email from imap.mail.yahoo.com, but cannot receive from smtp.mail.yahoo.com. I have not changed these settings in years and as of a few days ago they stopped working. These settings work fine on my iPhone and iPad.
So far I have:
-Deleted accounts and reestablished them
-Deleted the Mail preference file ->com.apple.mail.plist

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    iTunes: Restoring iOS software - Support - Apple

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