Yahoo! Mail Plus costs $19.99 per year, and renews automatically on an annual basis. We'll let you know of an upcoming billing cycle by sending a reminder email to the alternate email address you provide when purchasing the service.

Interested in Yahoo! Mail Plus?

1. Log in to your Yahoo! Mail account and click "Options."
2. Under "Premium Services," click "Mail Plus."
3. Click "Order Now."

You can also visit the sign-up page directly by clicking here.