Problems Using Yahoo Mail with the Mac Mail Client

Hello everyone,I can no longer send mail using the mail client with my Yahoo mail email address. Apple says that it is because Yahoo was bought by Verizon and the only way that I will be able to use the Mac mail client is to pay for the upgraded version of Yahoo mail. Is this true? I have had this email address for 13 years. If I do upgrade will I be able to send mail using the mac's mail client? I don't see anything about using other mail clients in the description for Yahoo Mail Pro. Does anybody have any ideas? Please help! Sas