Instead of downloading raw dumps, use legitimate tools like the Google Search Console to monitor your own domain security.
In a technical context, a "Gmail Domain TXT" could refer to DNS TXT records used to verify ownership of a domain within Google Workspace . These records are essential for proving you control a domain before you can use Gmail for business. Risks of Downloading Unknown .txt Files
Large dumps like the ALIEN TXTBASE are often analyzed by security professionals and services like Have I Been Pwned to help users verify if their data has been compromised.