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Best one I've ever used was Fastmail's web mail. But it's locked to their platform, so yeah.
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eM Client for various M365 and IMAP accounts. ElectronMail for the 9 ProtonMail accounts I have (allows "tabs" for each account in one client).
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I use FairEmail on Android, which aggregates both my Gmail and self-hosted accounts.

I use Gmail's web interface for my Gmail account (which, I'll admit, makes my little rant above more than a little hypocritical)

And in my self hosted email setup I use RoundCube (web interface).

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> (which, I'll admit, makes my little rant above more than a little hypocritical)

Na, that would simply be the kaleidoscope part you mentioned, wouldn't it? For what it's worth, I found the combination just as peculiar as you did.

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Mac/iOS Mail is pretty lightweight. I used to use Thunderbird on Linux.
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Surprisingly, Mac mail is a really nice client. It reminds me of how quick eudora was back in the day.
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EmClient, Mailcraft
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