To add your email account to your iPhone or iPad please follow these instructions:
Open Settings on your device and swipe down to the Mail icon and tap to open.
Tap on Accounts
Tap on Add Account
Tap on Other
Tap on Add Mail Account
Type in your name, your email address and your email password and tap on Next
Type in the Incoming and Outgoing Mail server settings.
Make sure the Server Type is set to IMAP
The Incoming Host Name will be your domain name.
mail.<your.domain.name>
Username is your complete Email Address
Password is your email Password
Important: Repeat the same values for the Outgoing.
Even though it says they are optional you must enter the username and password for outgoing.
Tap on Next when done
Your mail settings will now be verified.
If there are any issues correct them. Make sure your username is your full email address and you have typed your password and host names correctly.
Once verified, tap on Save and then open your Mail app to start using email.