Since today i have the following error in my /var/log/mail.warn file: warning: database /etc/postfix/virtusertable.db is older than source file /etc/postfix/virtusertable I gave the command postmap /etc/postfix/virtusertable to and restarted postfix to solve the problem, but this but it does not help. What steps can i take to solve this problem and more important, how is it possible that this suddenly occur? ***edit*** Now I've tried these commands: updatedb locate hosts postmap /etc/postfix/virtusertable /etc/init.d/postfix restart And i verify the results... ***edit*** It's working. The commands: updatedb locate hosts did the trick. I'm still wondering how this could happen? Can anyone tell me more, why errors like descibed above suddenly can appear?