go to mail, then click settings, there is a section called, blocked addre4sses. take the address of the senders of spam and add it to the list, then yahoo blocks them from your mail. there are positions available to block 1000-different spammers' addresses.
myself, i have spammers from website using disposable addresses numerous times; so saying, that you may have to block one website numerous times
phishing and spamming.