KMailCvt: duplicate subject error

[Lane]

I've downloaded several mail archives in text format, and I'm trying to import 
them into kmail.

The archives are one per month, so I used a perl script to split out the 
individual messages into unique filenames in a temporary folder.

When I first ran KMailCvt to import these message only 165 of 462 messages 
were imported.  Those which were not imported produced a dialog message 
saying "Duplicate subject ... message not imported"

So I modified the script to create unique Message-ID's and subjects from the 
arcive, deleted the folder that was created during the first import, 
compacted all folders, exited kmail then restarted kmail and tried the import 
again.

This time EVERY message was rejected for import because of "Duplicate 
subject ..."

What gives?  How unique does a message have to be before kmailcvt will import 
it?

thanks,

lane
P.S.  I'm on FreeBSD 5.3 using KDE 3.31
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