Provide possibility to turn off user authentication

[dettmering]

I'm hosting Snibox locally at home, I'm the only user so there's no need for a user management or authentication. Would it be possible to provide a way (e. g. as an environment variable) to turn off user authentication? This would save me the headache of remembering and losing an unnecessary password.

[rantanlan]

Also i would love to see this without the need of a third party tool (mailgun in this instance) since I like to be as much independend as i can. Thanks