I'd love it - email could use serious tools and refinement - but so many questions: Is it local or hosted? What is the story with privacy? Do you use an existing application (like a Thunderbird fork) or something you created?

Can you / will you integrate other messaging such as SMS, even WhatsApp, etc.? RSS?

It says "all platforms" but does not list Linux. Is Linux support planned?

How does it compare to Apple Mail? That’s my reference local email client.

Good luck with that, but as a first reaction I must say, what I see on that side is not that impressive. It's just the same feature-set & interface all over again. It's not selling me any reason why I should be more interested in this, than in all the other clients already available.

Granted there is very little on that side, but I hope if you really start from scratch, you will also look more outside the box of the established mail clients. Think about how RSS Feed readers are working and the interfaces they offer, think about task&note-managment-tools are working and what they offer. For example, why is there no mail client with a kanban-board-view, allowing to organize mails by status or tags. Why is there no client with a social media feed-interface or even a tweetdeck-like view, allowing to observe multiple mail sources in parallel. This is the kind of innovation I'd like to see in a new mail client. Not just a bit better performance and new colors.

Your link does not work?