store-location keep empty folders

Qqblog Qqblog <[email protected]>
Newsgroups gmane.comp.mobile.kannel.devel
Message-ID <[email protected]> 
group = core

store-type = spool
store-location = /etc/kannel/queue

After I added store-type and store-location, store-location still leave many empty folders after message delivered, folder name is numeric like 13,14, 61,67 ... How to configure your system to remove them ?
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