TXT records are a type of DNS records used to provide text information about a domain, that can be read by external sources. To ensure high inbox rates and low spam rates, some services like Google require that you add a TXT record to your domain setting to verify that you own the domain.
Learn how you can add Google TXT site verification records to all your subdomains that are used to send emails to GMAIL addresses with Campaign Control Panel through this ho-to video tutorial: Google TXT record management
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