As you are talking to other customers here as it stands your post isn't very clear, your title says "emails deleted" so do you mean they have all gone from your inbox as sadly this does happen with Yahoo which is why it is never a good idea to leave them all stored there. You could try this to see if they can be retrieved:
https://help.yahoo.com/kb/SLN2552.html
If they are restored then it would be advisable not to store all your emails in your inbox if this is where they were located, but instead set up separate folders to keep them in.
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