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• kontact - part of kde neon, fully featured, keyboard responsive, ui might not be so small screen friendly
• thunderbird
• sylphead
• mutt - fully keyboard friendly as runs in a terminal
• kube - new from kde folk, looks to be going in a good direction, reasonable dependency tree designed to be run on many platforms, qtquick ui so easy to make it adapt to smaller screens, keyboard responsiveness is in design documents. See kube building