How to change the address Qmail send error message (MAILER-DAEMON@hostname)

Plesk administrator's email address is listed in the following files: (By default)
/var/qmail/alias/.qmail-mailer-daemon
/var/qmail/alias/.qmail-postmaster
/var/qmail/alias/.qmail-root


Edit the above files and set the email which you need. The qmail error message of the form MAILER
-DAEMON@hostname will be send to that email id.