left shift key starts kmail

[Eric Lemoine]

Hey

I have a very annoying problem on Kubuntu/Edgy: if I hit the right
shift key of my keyboard then a Composer - Kmail window pops up. This
is very very irritating as I need this shift key for something else
than the kmail composer. I opened System Setting with the hope of
disabling this keyboard shortcut, but I didn't find any way to do it!
I'd appreciate help as this one's really starting to drive me crazy...

Thanks,
-- 
Eric