Mailer: Ability to force TLS

[Apple]

Mailer: Ability to force TLS
NodeJS, but applies to other server targets as well

@patrick

Uncheck the Use SSL, it will use STARTTLS automatically if the server features it. Server should advertise that it supports it.

This is susceptible to MITM attacks. There should be an option to force TLS even if the server doesn't advertise it, to prevent MITM attacks.