Change your default sending address in New Yahoo Mail

The default sending account is the email address that pre-populates as the "From" address when you create a new message. If you have an extra email address set up, or another email address linked to your Yahoo Mail account, you can choose one of them as your default sending address by following the steps below.

1. Click the More options icon | select Settings .
2. Click Writing email.
3. In the Default sending address?drop-down menu, select your preferred email address.