It doesn't have all the add-ons that Thunderbird has, but it has a lot of functionality built-in and seems to just work. With Thunderbird I need about ~3 add-ons for my workflow, I have to worry about API changes and compatibility over time, and there are still small papercuts, especially with the composer and calendar, that have never been fixed.
I have tried Kmail and Evolution and haven't been impressed. They don't even work with my email provider, at least not out of the box.
Mailspring is not perfect either but it has the best experience out of the box with minimal configuration.
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