Not looking for a server as I use fastmail currently but a client would be nice. I am currently using spark on iOS and Mac OS and just fastmail website on my Linux desktop. I’m realizing spark is nothing special and would rather not renew my subscription.
The best self hosted email client with good web clients is crossbox.io
The problem is the pricing is not made for individuals but for resellers.
For a reseller is very cheap, but for an individual is too expensive