Empty databases and recreate indexes from scratch

Hi

I'm getting such a lot of duplicates mails (i use filtering) and i'm not sure 
where the problem lies. Its is also creating a situation where it takes ages 
(and sometimes not at all) to show the contents of a folder in kmail. 
Is there a wiki or something that would instruct on how to remove all files 
that feed off kmail and start it all from scratch? 

I'm not sure if i'm even asking the correct question.

Thanks

Ian
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