Yeah, and I briefly considered that, but in truth I can't be bothered to run software stack of this complexity for my personal use for this. It's designed as a mutli-user web app, and that shows in the number of different services used in the backend. I like the idea of an app that sorts my email better, but not that much.

I would say I don't consider this a criticism of the product - they're clearly selling a hosted product that they were kind enough to open source, not making a product for end users to run that they happen to sell a hosted version of. It being inconvenient to self host doesn't reflect poorly on them.