When you block an address for your yahoo e-mail does the sender know their mail is blocked?

Do they get a message sent back to them that it has been blocked? thx

When you block an address for your yahoo e-mail does the sender know their mail is blocked?
The sender has no idea---far as they know, you're still getting their mail.


Any message they send you will be deleted immediately (not sent back to them)---you'll never see them---AND NO notice is ever sent to them.
Reply:No, but if they try to send you mail, it will be returned to them saying that it could not be delivered..and ect.....