[Dovecot] Maildir and Invalid data in file

[Patryk]

Hello,

I'm using dovecot version 1.0.13 on reiserfs on hardware RAID-0, but I'm getting the 
following error in the logs every time one user tries to access his old mails in the .Sent 
directory:

dovecot: 2008-06-23 15:09:46 Error: IMAP(marek.chajecki): Invalid data in file 
/var/mail/Maildir/marek.chajecki/.Sent/dovecot-uidlist

As a result he fails to get access to the emails in this folder.

I've googled a bit and read that deleting the uidlist makes dovecot recreate it, but after 
some time the same thing happens. It's a new hard drive, so I don't think this is a hard 
drive fault.

Some additional info: this server is being used by about 200 users who get about 100 
emails daily each one of them.

Config:

root at warsaw Maildir # dovecot -n
# 1.0.13: /etc/dovecot/dovecot.conf
log_path: /var/log/dovecot.log
info_log_path: /var/log/dovecot.log
log_timestamp: %Y-%m-%d %H:%M:%S
ssl_listen: *
login_dir: /var/run/dovecot/login
login_executable: /usr/libexec/dovecot/imap-login
login_process_per_connection: no
login_processes_count: 15
login_max_processes_count: 512
max_mail_processes: 4096
mail_privileged_group: mail
mail_location: maildir:/var/mail/Maildir/%u
maildir_copy_with_hardlinks: yes
auth default:
   worker_max_count: 100
   passdb:
     driver: pam
     args: cache_key=%u dovecot
   userdb:
     driver: passwd

Any help will be appreciated!

-- 
Regards,
Patryk Rzadzinski