That new subfolder is added since KDE SC 4.12. Reproducible: Always
Is this only used by kmail?
(In reply to Johannes Huber from comment #1) > Is this only used by kmail? @Jekyll, do you know?
Sorry for the late response. Unfortunately, I really don't know. I don't use kmail daily as my main email client, and I noticed this missing part only accidentally when playing with ArchLinux and found a new menu item which was absent in Gentoo.
Thanks for reporting. This is fixed in kde-base/kmail-4.12.3-r1 and later. Please sync in some hours to get the changes. + + 11 Mar 2014; Johannes Huber <johu@gentoo.org> +kmail-4.12.3-r1.ebuild, + -kmail-4.12.3.ebuild: + Revision bump adds missing mboximporter/ subfolder, bug #491406. + http://git.overlays.gentoo.org/gitweb/?p=proj/kde.git;a=commit;h=c6a41ded5a7365d8d95b330d61f7affebacd2ae5