Untouchable e-mails in KMail

Hello list,

I have a very-low-traffic e-mail folder which received a message yesterday via 
my ISP's POP3 service. At intervals after that I noticed two duplicates, then 
two more and so on until I had 30 of them by this morning.

I can delete all of the duplicates except what I assume was the first pair. 
They remain in place, marked unread, and when I run the dedup process (Folder 
> Remove duplicate messages) I get this error once for each of them:
	"Unable to fetch item from backend (collection 15) : Unable to retrieve
	item from resource: Invalid item retrieved"

The real message had a .doc attachment, probably produced by a version of MS 
Word. That document opens nicely in Libre Office.

It looks as though I need to dig into the works to find and remove the offending 
entries in whatever database is involved - can anyone advise me?

-- 
Regards
Peter

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