Rocketmail settings for ipad email setup---help
I beleive Yahoo purchased Rocketmail some time ago. Try using the Yahoo option in Add Account (Settings app > Mail, Contacts, Calendars > Add Account > Yahoo. If you are not successful with that, contact Support for rocketmail/Yahoo.
iOS: Unable to send or receive email
Can’t Send Emails on iPad – Troubleshooting Steps
Retrieving data ...