there is a kmail 4.8.0/kdelibs 4.8.1 bug that results in kmail crashing when scrolling around. See this bug: https://bugs.kde.org/show_bug.cgi?id=295474 The patch in comment 27 fixed that problem for me and others. I think it would be a good idea to add it to kdelibs 4.8.1
*** Bug 408445 has been marked as a duplicate of this bug. ***
Thanks, patch added. + 16 Mar 2012; Johannes Huber <johu@gentoo.org> + +files/kdelibs-4.8.1-nepomuk-kmail.patch, +kdelibs-4.8.1-r1.ebuild: + Revision bump adds upstream patch to fix crashes in kmail caused by nepomuk + concurrency problems. This is issue is fixed in KDE SC 4.8.2. Patch spotted by + Volker Hemmann <volkerarmin@googlemail.com>. Fixes bug #408421.