For Microsoft Outlook 2016 (Mac)
This article explains how to set up a new Microsoft Exchange 2013 email address in Microsoft Outlook 2016 on your Mac.
Outlook 2016's Auto Account Setup feature requires an autodiscover record for the domain of the email address being set up. Nearly all IONOS domains already have this record set automatically.
Start Outlook 2016 for Mac on your Apple computer.
From the menu bar, go to Tools > Accounts.
Select Exchange account for the account type.
Click Add Email Account.
Enter your Microsoft Exchange 2013 email address.
Click Non IMAP? in the top-right corner.
Click on Exchange.
Enter your Microsoft Exchange 2013 email address in the DOMAIN\Username or email field.
In the Password field, enter the password you assigned when you set up Microsoft Exchange 2013.
In the Server field (optional), enter the server exchange.ionos.us.
Click Add Account.
You are prompted to authorize Autodiscover to set up Outlook on your behalf. Click Allow.
Click on Done.