> email is still mostly sent as plain text over the internet, that's certainly a downside. Opportunistic TLS for SMTP seems to have been dominant on the US po

> email is still mostly sent as plain text over the internet, that's certainly a downside. Opportunistic TLS for SMTP seems to have been dominant on the US portion of the internet for nearly a decade. Especially as email is concentrated in a few huge providers who have been using STARTTLS for many years. I say this based on the systems and logs I have monitored in that same timeframe. In fact, many email systems (mostly corporate MS Exchange) appear to be configured to reject or spam-bucket email connections that don’t support STARTTLS with a public CA certificate. (This observation may be biased by covering the financial services industry more than others.)