This bug, while only affecting sdbox users, is severe. I suspect it will trigger a 2.0.13 release soon but, in the meantime, I would highly recommend bumping 2.0.12 to inlude the following patch: http://hg.dovecot.org/dovecot-2.0/rev/663528c5c799
+*dovecot-2.0.12-r2 (30 Apr 2011) + + 30 Apr 2011; Eray Aslan <eras@gentoo.org> +dovecot-2.0.12-r2.ebuild, + +files/dovecot-2.0.12-sdbox.patch: + Backport sdbox patch - bug #365445. Thanks to Kerin Millar. + Thanks for the heads up.