Wheezy, KDE & autostart

I've got a problem with my KDE 4.6 on wheezy.

At beginning of session, it always starts iceodve, even if there is no
.desktop file in .kde/Autostart (and thus no icedove idem in System
Settings -> startup & shutdown -> autostart)

I do not use session saving, so where could the invocation of icedove be ?

(and a find -L .kde -type f -print0|xargs -0 grep -i icedove did not
give anything, nor the same invocation in .local)

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