Updating Kmail folders outside of KMail

I have several KMail folders that have duplicate emails in them. Hundreds of 
emails. Rather than go through each one and try and compare the contents, to 
determine if deletion is required, I can use a few different methods to compare 
the contents, to find the duplicates.

Tools like fdupes or Beyond compare,etc.

However , I know from past experiences, that if I change a KMail folders 
contents, outside of KMail (file copy, remove,etc), it does not appear as it is 
on the hard drive.

No doubt it is the akonadi backend. Can I change a Kmail folder (content) and 
then issue some command to akonadi ?  

Or, is it as simple as "Update folder" ?

Regards,

Peter

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