I installed Kmail2 in Mageia 2, KDE 4.8.5, 64bit.
I used the packages from the official repository of Mageia 2.

Some times, when I sending or receiving email:
1-  first the emails are sent or downloaded. 
2 - Then, when the maildir folder syncs emails, several copies of emails are created (10 ou 12 copies). 

This error does not always occur. I can not repeat it. It occurs randomly
in most cases it works well without errors
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Initially this error (multiple copies) was going with a few emails, but every time. always.

I deleted the folder location Maildir, accessed the Kmail2 on "settings" under "Configure Kmail" and "Accounts" tab "receipt", I selected "Remove".

Once deleted, created automaticaly another folder "Maildir". Folders and emails are synced again. After that, I thought it would not happen more errors, but errors again occur sporadically and infrequently, but still happening.

Reproducible: Sometimes

Steps to Reproduce:
1. Some times, when I sending or receiving email:
2. first the emails are sent or downloaded. 
3.Then, when the maildir folder syncs emails, several copies of emails are created (10 ou 12 copies). 
Actual Results:  
Some times, when I sending or receiving email,  several copies of emails are created (10 ou 12 copies). 

Expected Results:  
Any update to fix this bug

I did a migration of emails from Kmail in Mageia 1 for Kmail2 in Mageia 2, importing multiple emails and folders.

https://bugs.kde.org/show_bug.cgi?id=305526