SMTP connections tend to be opportunistically encrypted, but intercepting the connection via MITM is much easier than for e.g. a HTTPS connection. So while it'

SMTP connections tend to be opportunistically encrypted, but intercepting the connection via MITM is much easier than for e.g. a HTTPS connection. So while it's true that most SMTP connections are encrypted, that doesn't mean anything unless the endpoints are enforcing trust on each other which mostly they're not.