Guide

1. On SendGrid's main dashboard, head over to the left-side panel and click 'Settings'.

2. Select 'Sender Authentication' from the list of options.

3. After that, go to the Authenticate Your Domain section and click 'Get Started'.

4. Choose your DNS (Domain Name Server) Host from the available options and confirm if you prefer to rewrite the tracking links using your custom domain. Once done, click 'Next'.

5. Enter your domain into the input field under 'Domain You Send From' and configure the corresponding Advanced Settings based on your preferences. Subsequently, tap 'Next' to proceed.

6. Review the DNS records displayed on your computer screen. One by one, copy and add them to the DNS section of your chosen host.

7. Finally, confirm that the required records have been added and then tap 'Verify' afterwards.