Carrying out a DNS Propagation Check

Authenticating the From Address for Emails contains the instructions for you to configure your DNS with authentication. Once you've completed them, you can use the DNS Propagation Checker website to verify that your configuration has propagated around the world:

whatsmydns.net

You will be ready to send emails when you see the entries from your recent update appearing on the site. If your configuration is unsuccessful, reach out to your DNS provider to check your entry syntax as it is unique to your provider's requirements. 

Note: Your individual propagation timeline is directly related to the TTL on your DNS configuration and the accuracy of your entries. It can take up to 24 hours for authentication status to update to mail servers globally.