Version:           4.7 (using KDE 4.7.1) 
OS:                Linux

After some days of use kmail2 always shows the wrong mails to the wrong headers in my imap account. Lets assume I have the following mails on my imap account:

a -> body a
b -> body b
c -> body c

After some days after creating the account in kmail2 the account looks like this in kmail2:

a -> body c
b -> body a
c -> body b

There is no defined "order" in mixing up the mails, this is just one example.

I use an official imap account and the mails are correct on the server.
Deleting the imap account from kmail2 and recreating shows the mails correct again for some time. But mixing up keeps coming back.

Reproducible: Didn't try

Steps to Reproduce:
There are no steps since I don't know whats triggering the mixing up.

Actual Results:  
Mails get mixed up:

a -> body c
b -> body a
c -> body b

Expected Results:  
Mails get not mixed up:
a -> body a
b -> body b
c -> body c

I use filterrules and spamfilterrules created with the wizard for spamd.

On the pop accounts there is no problem except the already known lots of conflicts which I suspect are triggered by the spam filter rules.