I don't know what social circle I should be part of to consider email unsecure. Even Russian spies use mail.ru and their emails are compromised not by SMTP Mit

I don't know what social circle I should be part of to consider email unsecure. Even Russian spies use mail.ru and their emails are compromised not by SMTP MitM but by weak passwords, google for "moscow1 moscow2 password" to see what I am talking about ) Anyway. Back to the technical point. Email servers pretty much always use TLS to talk to each other. The connection may degrade to non-encrypted for backwards compatibility, unlike HTTPS. But it's vanishingly rare. So, for all practical purposes that affect ordinary citizens: injection, scanning and sensitive information extraction, email in transit is quite secure.