Ask HN: For those who host their own email, which email client do you prefer?

There's an Ask HN whether people host their own email [0]. I host my own email using Mail-in-a-box [1] for my secondary domain and am planning to move my primary domain there as well. However, I've not found a good email client till now (having been spoilt by Gmail!)

For other email hosters - which is your preferred email client?

I would like something which had configurable keyboard shortcuts and a fairly good UX.

I don't know why, many desktop and mobile email client applications look a bit dated to me!

[0]: https://news.ycombinator.com/item?id=34117386

[1]: https://mailinabox.email/