Add or edit custom DNS records in Office 365
Check the Domains FAQ if you don't find what you're looking for.
Sign in to Office 365 with your work or school account.
Choose Setup > Domains.
On the Domains page, select a domain.
Under DNS settings, choose Custom Records, and then choose New custom record.
Choose the type of DNS record you want to add, and type the information for the new record.
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