Creating Subdomains in the IONOS Domain Centre and Configuring CNAME Records for Microsoft 365

To use an MX record together with the CNAME Records, you need to create a subdomain for the particular CNAME record in the IONOS Control Panel.

You then have to configure the corresponding CNAME record for these subdomains. The names of the required subdomains are listed in the Microsoft 365 Admin Centre on the Update DNS Settings page under CNAME Records in the Host column. The table also contains the addresses and values you will need for the CNAME records.

Adding CNAME Records in the IONOS Domain Centre

You can find more information about configuring a CNAME record here.

Log In and Configure a CNAME RecordConfigure a CNAME Record