97.8% of the top 10,000 domains have no MTA-STS. Here's how to be in the other 2%

Of the 10,000 most-visited domains on the web, 97.8% have no MTA-STS policy at all. Not misconfigured. Not weak. Just absent. I scanned the Tranco top 10,000 in June and MTA-STS is the single most-ign