[CentOS] hi

Fri Sep 28 19:19:27 UTC 2012
Andrei Rolando León Salas <andreileonsalas at gmail.com>

Hello how are u, im having a little problem. i use the webmin to install
automatly postfix, in the other server works, but in this now says.

Error while checking current Postfix configuration. Please manually fix
Postfix configuration.

postfix: fatal: file /etc/postfix/main.cf: parameter mail_owner:
unknown user name value: postfix

Manually edit the Postfix configuration

i dont know what to do, can u help me please