If you mistakenly deleted any of your Yahoo emails or any email went missing in the past seven days, then recover your lost messages in the following way.
First, you have to log in the Yahoo account.
Move to the Trash folder.
Then open the deleted message or email that you need to recover.
Press on the Move button in the Yahoo Mail toolbar.
Then pick the Inbox option or any other folder where you would like to move the deleted email.
Note: if you miss the one-week deadline, then you can only restore lost or deleted emails from Yahoo by just a request form as defined above step still if you want to recover lost yahoo account then follow the provided link.