Kmail strange behaviour

Hi kdepim mailing list !

I'm experiencing some really anoying pb with kmail since 1 or 2 weeks.

It begins like this :  

The connexion to mail server seems to fail | do nothing : When I check the 
status widget button on the right bottom of my window, the connexion is at 0% 
and nothing happens. 

Mails are received on this account, as I can check some new mail through the 
webmail.

The I choose to troubleshoot IMAP cache which ends with success status.

Next and real problems begins : 

All mails in the inbox folder are deleted one by one :/
After that they are again downloaded to my mail client, one by one... 
In the end numerous mail are duplicated.

It takes a really long time since I've got something more than 8 thousand mail 
in my inbox (not good I know), but an entreprise class Mail Client like kMail 
should be able to manage so much mail.

It's really annoying since I've tried numerous mail client (Evolution, 
Thunderbird, Claws-mail, and so on) but I really don't wanna use another one. 

U know why : 
kMail rocks, the K Environnement rocks too : 
 * Professionnal
 * Usable
 * Calendar - Notes - RSS  - Address book integration - Spam aware.
 * Intelligent Message status (read / unread / todo assignation ...)

Regards. 


Technical information : 

Client Side : 

OS : Fedora Core 10
Kontact Version 1.3
KMail Version 1.10.3

Server Side : 
OS : Debian 
postfix : 2.3.8-2+etch1

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