Understanding Email Encryption (fastmail.com)

> Additionally, servers don’t verify certificates by default. […] This is because verifying the certificate adds no security when an active attacker could just fall back to an unencrypted connection.

But surely the eventual goal is encrypted-only, at which time that’s no longer the case. Not verifying certificates feels like it may just slow down the process, because now when it looks okay you may actually find it’s not, the error is just masked for now.