In your iPhone, got to Settings > Accounts & Passwords.
Select Add Account.
Select “Add Mail Account”.
Insert your name, email, and password. Click “Next” when done.
Host Name is start with “mail.” and following with your website address.
Username is your email address.
And password is your password to your email address.
Input the same for both Incoming and Outgoing Server
Make sure “Mail” is selected, click “Save”.
Now you can send and receive email from your iOS device.