Explain how to contribute code
I'm a developer and free software advocate. Tutanota seems like a cool project. But I don't see how I can get involved with contributing. There is no public issue tracker. No guide to get started. I wouldn't want to work on a feature without proposing it first and getting some idea if my work would be accepted.
I guess this is supposed to be a business model rather than "free" software. So I don't think they will share their full code in public nor will they accept contributions from outside the company. so there's also no need for a public issue tracker or something. Even though there is a free version of Tutanota I think the main goal of them is doing this for a living and sell premium subscriptions. I might be wrong however.