+1 for Kmail. One detail I found is that it's underlying engine, Akonadi, is unstable/prone to unsolvable problems (I tried!). Debian stable's version is howeve

+1 for Kmail. One detail I found is that it's underlying engine, Akonadi, is unstable/prone to unsolvable problems (I tried!). Debian stable's version is however, of course, rock steady.