One of many tiny errors or design flaw for the New Yahoo Mail.
Main Account and a sub account attached to it. I go to my Sub account, and reply to an e-mail. It shows the "Send name" as the Main Account, but has the e-mail as my Sub account. It's not changing the display name as my Sub Account's info.
Old version of the Mail, doesn't allow to add a Sub Account from a Yahoo E-mail. It can only add it from other services. Must use New Yahoo Mail to enable Sub Accounts under the main Yahoo E-mail.
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