Kmail does not delete old mail headers

Hi,

I noticed, that kmail's imap directory
"~/.kde/share/apps/kmail/imap/" is 
getting larger and larger. I seems that kmail downloads all
mail headers to 
certain files (e. g. INBOX) but does not delete the
corresponding headers on 
mail deletion. Hence, these files are getting quite big over
time. Is this 
the intended behavior of kmail or can I configure kmail to
delete old headers 
in these files?

regards,
Jörg


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