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The selling point is that it's IMAP primitive, as the blog post mentions.
Thunderbird is nice, but it's not cross-platform. Superhuman and Notion Mail are nice, but they only support Google and Outlook.
Apple Mail is truly awful.
There's a gap in the market, and as I said we're building it for ourselves.
It’s the first thing you do if you are trying to make a product that you plan to monetize is ask - who is the ideal user and how will we market it. If it’s just a hobby project to learn a new to you technology, that’s fine or if you just wanted to scratch an itch.