Sure, not widely supported, but if you use clients supporting it, it is great. Blazingly fast, while IMAP is always slow.
Also, Thunderbird is working on JMAP support: https://blog.thunderbird.net/2025/09/state-of-the-thunder-mozilla-connect-updates/
My mailserver runs on Stalwart. Whatever it does works for me. I haven’t yet had to change the defaults. It’s also very easy to set up and requires next to no maintenance.
(It also does JMAP, which is like IMAP, but modern and efficient)
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Ltt.rs works quite well on Android. Even without a client I’d be glad to have it already, I’m ready when Thunderbird is ready.