[Dovecot] Problem managing mbox

[PSTM]

Hello,

I have a problem with dovecot. seems that do not erase mail that mail 
client request to be erased.
And I have this errors:
>  Error: Next message unexpectedly corrupted in mbox file
Info:

> dovecot-2.1.1-2.0.cf.fc16.i686


> root      5979  0.0  0.1   3208  1260 ?        Ss   20:18   0:00 
> /usr/sbin/dovecot -F


> dovenull  5985  0.0  0.2   7060  2280 ?        S    20:18   0:00 
> dovecot/imap-login
> vmail     5988  0.0  0.1   7888  1848 ?        S    20:18   0:00 
> dovecot/imap

permissions on mail dir:
> total 4
> drwxr-xr-x 9 vmail mail 4096 ene 21 21:43 vmail


Any suggestion?

Regards,


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