To add a Rackspace Email account to your iPhone:

1. Go to Settings > Passwords & Accounts, then tap Add Account.

2. Tap Other, then tap Add Mail Account.

3. Enter your name, email address, password, and a description for your account.

4. Choose IMAP for your new account.

5. Enter the information for Incoming Mail Server and Outgoing Mail Server. Then tap Next.

6. If your email settings are correct, tap Save to finish. If the email settings are incorrect, you'll be asked to edit them.