1. Go to Settings of you IOS device.
2. Click on Mail, then select Accounts on the next page.
3. Click Add Account.
4. Choose Other, then select Add Mail Account on the next page.
5. Enter your Name, Email, Password and Description that you like.
6. Click Next.
7. Choose IMAP or POP account.
8. For INCOMING MAIL SERVER:
-Host Name: mail.yourdomain.com
-Username: your full email address
-Password: your email password
9. For OUTGOING MAIL SERVER:
-Host Name: mail.yourdomain.com
-Username: your full email address
-Password: your email password
10. Click on Save.