Mail.app in 10.9 seems slightly less crappy than in 10.8, but the overall experience has been going steadily downhill for years now. I've been using Mac OS X + Mail.app since the public beta was released in Sep 2000.
Having tinkered around with other mail clients for the Mac, I'm starting to believe that something in the vein of mu4e[1] holds the only truly brighter future for me, but it will be such a radical break after years with Mail.app that I'm hesitant to take the plunge. On the other hand, I am "living" in multi-term[2] now rather than iTerm2, so it probably won't be all that jarring to emacs-ify another element of my daily computing experience.
Having tinkered around with other mail clients for the Mac, I'm starting to believe that something in the vein of mu4e[1] holds the only truly brighter future for me, but it will be such a radical break after years with Mail.app that I'm hesitant to take the plunge. On the other hand, I am "living" in multi-term[2] now rather than iTerm2, so it probably won't be all that jarring to emacs-ify another element of my daily computing experience.
[1] http://www.djcbsoftware.nl/code/mu/mu4e.html
[2] http://www.emacswiki.org/emacs/MultiTerm