Yahoo Mail and RocketMail have merged into a single email service. While creating a new RocketMail account is no longer possible, you can still access an existing RocketMail account through Yahoo Mail just by logging in.
Access Your Existing RocketMail Account
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To access your existing RocketMail account, visit Yahoo Mail's login page and type your email address and password. Include your RocketMail domain name attached to your username, as in email@example.com. Logging in using Yahoo Mail does not switch your email address or domain name in any way. Everything should function normally, just under the new brand.