Excellent! Strict transport security for SMTP has been sorely needed. Once it's widely deployed, it will finally ensure that virtually all email communication o

Excellent! Strict transport security for SMTP has been sorely needed. Once it's widely deployed, it will finally ensure that virtually all email communication occurs over TLS. TLS is already widely supported among large ISPs, but until now it has been far too easy to fall back to plaintext. There wasn't any way for a receiving ISP to ask all senders to use TLS and not fall back, which meant it happened occasionally. It's why Google's "Safer Email" transparency report shows many senders at 99% percent TLS, rather than 100%: https://www.google.com/transparencyreport/saferemail/ https://www.google.com/transparencyreport/saferemail/ As receivers deploy strict TLS policies, and as senders add support, I expect to see these numbers reach 100% and stay there. I look forward to having strict TLS support in place in our email systems. Nice job making this happen, folks who contributed!