Email bounces and boilerplate footer to the error message

I use cgi::carp fatalsToBrowser to be able to display important error messages to the end user when my perl scripts barf. However, a boilerplate footer to the error message always appears together with the date and time of the error:
"For help, please send mail to the webmaster (root@localhost).”
I tell the people in our network to try to send an email to localhost, but they complain that the message only bounces. Where should I put the email address in parenthesis?
