> MTA-STS is needed because the system to deliver email over the internet (SMTP) has a fallback method where it will switch to an unencrypted connection if the

> MTA-STS is needed because the system to deliver email over the internet (SMTP) has a fallback method where it will switch to an unencrypted connection if the encrypted connection fails for some reason. I couldn’t possibly see any simpler way to solve this very basic problem. /sarcasm