A DNS record type that can be used in place of a TXT record to prove you own a custom domain. Set a high priority value on it so that current mail delivery is not affected.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains MX in context, with comparison tables and the common traps.
Terms in this definition
- DNS
The system that turns names into addresses. In Azure, private endpoints depend on private DNS zones, which are queried through 168.63.129.16.
- TXT record
A DNS record containing free-form text, commonly used to prove ownership of a domain.
- Custom domain
A DNS name of your own attached to a service. In an Entra tenant it is verified through a TXT or MX record, and every on-premises UPN suffix used to sign in must be one (.local can't be); for App Service it is bound with CNAME or TXT validation.
- Set
Secret permission in Key Vault for writing secrets; some older material refers to it as Create.
- Priority
Routing method in Traffic Manager for active/passive failover: traffic goes to whichever healthy endpoint has the highest priority.