Verified answer

You would use the blocked address list.

Click "options ↬ mail options ↬ Blocked Addresses (in left column)".

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You can block an address and Yahoo will delete any future emails arriving from that address immediately----and you'll never see any of them.

That email will NOT be returned to the sender (Yahoo deletes it), and they aren't notified that they have been blocked (for security reasons).

They will think you're still getting their emails.

Mail page>>options>>mail options>>Spam (or Delete Addresses), from the list on the left).

Enter that exact address in the space provided>>click "add block">>then click "save changes" at the top of the page.

If the sender is sending those emails utilising the comparable e mail handle, I advise which you upload the e mail handle on your blocked addresses checklist. to do this, click the "concepts" link on the better suitable area of your mail web site and choose "Mail concepts." Then click "unsolicited mail" (for brand spanking new mail version shoppers) or "Blocked Addresses" (for traditional version shoppers)

Looking forward to an answer..I have the same problem.