You can create, edit, and delete email addresses from the Email Control Panel in your Yahoo! Small Business account.
How to manage email addresses from the Email Control Panel.
There are a few ways to reach your Email Control Panel:
Web Hosting customers:
Click the Email tab on your Web Hosting Control Panel.
Web Hosting Control Panel Email Tab.
All Business Email customers:
Sign in to your Business Control Panel and click the "Email Control Panel" link associated with your plan.
Business Control Panel Email Control Panel Link
Start from your Web mail interface:
Sign in to your account at http://mail.yourdomain.com/
Note: Be sure to replace "yourdomain.com" with your domain name. You'll be prompted to enter your Yahoo! ID and password if you haven't already.
Business Email Welcome Message.
Welcome Menu: Address List
Mail Options Menu: Administration
Business Email Administration: Manage Link