Wow, I'm glad that this is official now. Is there a list of providers supporting MTA STS? I've seen Gmail has appropriate policy files and records but I've neve

Wow, I'm glad that this is official now. Is there a list of providers supporting MTA STS? I've seen Gmail has appropriate policy files and records but I've never seen anyone hit mta-sts subdomain on my own domain (meaning no one is checking it).