If you already have a Yahoo! Mail, then you can get an alternate address under the same Yahoo! account.
Steps
Step 1. Log in to your Yahoo! account

Step 2. In the upper right corner, click on the gear icon and select "Settings" from the menu

Step 3. In the left pane, click "Accounts"
Click "Create an extra email address"

Step 4. Enter the email address you want to receive and click "Check availability" to check the availability of the address
