Do we have any confirmation that Google has mandatory TLS? IIRC, STARTTLS may not be mandatory and be just purely opportunistic. So relying on STARTTLS only is

Do we have any confirmation that Google has mandatory TLS? IIRC, STARTTLS may not be mandatory and be just purely opportunistic. So relying on STARTTLS only is not a good idea. https://serverfault.com/questions/523804/is-starttls-more-safe-than-tls-ssl https://serverfault.com/questions/523804/is-starttls-more-sa...