That's because the app only FORWARDS all your MAIL to your Yahoo address. It has nothing to do with E-mail applications.<br><br>Currently, you can use an app like YMail to have an icon in your menu bar that checks your Yahoo Mail for you and notifies you when you have some, but you can't send with it - and I don't know of any app that will allow you to receive or send Yahoo email using Apple's Mail application.<br><br><br><br>
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