Several questions concerning CI4 controller

Yes sure, as you can see above I configged it already as TLS.
Despite of remote or not to my knowledge there is a certificate necessary to connect to the postfix server.
The or my postfix server won't even think about letting you connect without one as it is running 100% encrypted in either way.

How does CI establish the connection to the email server and how does CI establish the tls handshake and stuff.
That's what my quest is/was aiming on and so far I can judge it there is a gap to fill in the documentation isn't it?

Or is it there somewhere out there a 'holy grail of email' and I need to search for my coconut again and ride out to find it? :-)