Configure email for iOS on an iPhone or iPad.
Choose POP or IMAP when creating an account (typical setup is POP).
Name: Your name - Your Business
Incoming server: mail.YOURDOMAIN.com.au
Outgoing server: mail.YOURDOMAIN.com.au
The device will try to verify the details entered. When the warning appears saying 'Cannot Verify Server Identity', tap on 'continue'.
After setup, you can verify your account works by sending yourself an email.