Email reporting: allow SMTP auth on unencrypted connections

[TheLastProject]

I want to use the email option together with gotify-smtp, which requires you to put the destination user that should receive the notifications in the authentication username field. However, Ofelia refuses to allow this:

mail.go:57 ▶️ ERROR Mail error: "unencrypted connection"

In general, I totally agree with this behaviour. But given I am only trying to communicate to another Docker container on the same network, there is no security issue that I can tell from using an unencrypted connection. It would be nice if there could be an option to allow authenticating over an unencrypted connection (disabled by default, of course). Thank you for considering :)