For Mail Business on iPhone and iPad
How to set up your Mail Business account from iOS version 15.
With Mail Business you have access to all your emails, calendar and contacts on your mobile devices even on the go.
Call up the settings.
Tap Add Account. If you have already set up an account in Mail, tap Accounts > Add Account.
Note that the Add Account menu item on iPadOS is accessible from Settings > Passwords and Accounts.
Select Microsoft Exchange as the account type.
Enter the email address of your Mail Business account and tap Next.
The following window appears:
Sign in to your "YOUR_E-MAIL ADDRESS" Exchange account using Microsoft?
Tap Configure Manually.
Enter your password.
A new window opens.
Now enter the following data:
Domain: Please leave this field empty.
Select which data (Mail, Contacts, Calendars, Reminders) you want to sync and tap Save.
Your email account will now be set up.