Open your iOS settings.
Search for "accounts" in the top search bar.
Select the option highlighted in the screenshot below.
Select "Add Account" and choose "Other".
Select "Add Mail Account".
Fill in your account information as shown in the screenshot below. Make sure the enter your full email.
Select the "IMAP" tab and fill in your account information.
Again make sure to enter your full email in the username field.
Set "Host Name" to box.courvix.com