I think the debug messages can be disabled with kdebugdialog, probably the checkbox "7017 kio (KIOConnection)". A quick look in the KDE bugzilla show that there are dozens of KDE bugs resulting in a flood of messages in xession-errors: http://bugs.kde.org/simple_search.cgi?id=kmail+xsession-errors Perhaps debug messages should be disabled altogether by default, until upstream manages to fix the crappy code so it doesn't spam the debug output. (Even syslogd has rate-limiting!)
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