Apart from using the spam filter, we feel that there is no ways to stop the unwanted emails, but there is. Yahoo mail is offering email blocking feature which yahoo technical support can help you to activate and let you decide upon whether a sender is a spammer or not. That means you do not have to worry about repeated emails. They will provide you with the block mailing list that support up to 500 mail addresses. When an email from a blocked address is received, Yahoo immediately deletes it, so you are not going to see it any more. To know more about this service you simply need to dial the toll-free yahoo helpline number.