Once the messages are deleted from Yahoo there is no way to retrieve them. The only exception might be a court order which would have the ability for Yahoo to go to their backup tapes to find a message, but even that is not guaranteed.
Jul 14, 2020 I cannot delete, archive or move any emails in yahoo mail Nov 27, 2019 How To Delete All Unread Emails In Yahoo Mail Jun 20, 2020 How to Permanently Delete Your Yahoo Mail Account
Feb 02, 2014
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Why are emails disappearing from my Yahoo mail inbox
Tip: How to Quickly and Easily Get Rid of Old E-Mails - Yahoo Feb 23, 2016 How to Recover Your Trashed Mail in Yahoo | Your Business You can recover any deleted email as long as it is still in the Trash folder. However, Yahoo empties the Trash folder occasionally. According to Yahoo, the exact intervals are unpredictable, so if you have mail in the Trash folder you'll need in the future, it's best to take action to recover the messages immediately. Deleting Email in Bulk in Yahoo Mail | A Slob Comes Clean Sep 17, 2014