Kontact/kmail2 'preferred' folders

I frequently move messages into different folders, and kmail saves a list of 
the folders I've used.  I'd like to clear that list and start over as the most 
commonly used folder appears near the bottom of the list.  I assume that this 
list is saved somewhere in the ~/.kde/share/config directory.  kmail2rc has 
"Recent Addresses" but I can't find recent folders in the same way.
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