[Fixed] Config options for local SMTP / Postfix Server

Hey,

I'm running an actual (1.25.0) vaultwarden installation and had tried to configure SMTP.

After some tests and some troubleshooting I have seen that there is no configuration option and in the code no "path" for
sending email without authentication and without certificates with an smtp server.

The smtp server is running on the same machine and trusts the local machine and all services that are running on the local machine so there is no need for TLS and Authentication.

lettre (The smtp library for rust) has the possibility to be used without auth and tls.

Is there a possibility to add this in the future?

Thanks for your work, you are doing a great job.

Cheers
Lex / RamShadow

PS I can read rust but have not the knowledge to write it by myself in the quality that I want