DeVliegendeHollander@feddit.nltoFree and Open Source Software@beehaw.org•Email service that integrates well with Thunderbird?
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8 months ago+1 for Mailbox.org! Works well with FairEmail (Android) and Evolution (Fedora). Evolution is a bit more polished than Thunderbird in my opinion.
And looks like the web interface gets a revamp this year: https://mailbox.org/en/post/we-are-celebrating-10-years-of-mailbox-org
Have you tried Heliboard? You’ll need to download a (proprietary?) library for it though. https://github.com/Helium314/HeliBoard