Block and Delete
Your current option to block and delete spam email does not work. While it may add any address to the blocked sender list, messages are not deleted. It will act as if is deleting the messages (even say that they were), just for them to still be in the Junk folder. It worked previously, now it is broken.
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Zach J
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The best way to get rid of spam is to mark as spam, not delete or block! This helps with your spam filters and does exactly what blocking does, prevents that email from coming to your Inbox. So please keep marking as spam! It is free and part of regular Yahoo Mail. Thanks!