Tap your Settings app.
On the left, select “Passwords & Accounts”, then tap ‘Add Account’ on the left.
Select ‘Other’.
Enter your name, email address and password.
Then, tap ‘Next’.
Verify that ‘IMAP’ is selected.
Incoming mail server
Host name: mail.restena.lu
Username: your username
Outgoing mail server
Host name: smtp.restena.lu
Scroll down
Outgoing mail server:
Username: your username
Password: your password
Then, tap ‘Next’
The app will verify your login data and let you know if it works or fails.
Tap ‘Save’.
Your email app is now configured and should receive all your Restena emails.