How can I change the MAILER-DAEMON message while bouncing mails?

Hi procmailers,

I need to change the domain name in the MAILER-DAEMON message when
bouncing back messages. So, if I bounce back messages from say,
"mydomain.net", instead of "MAILER-DAEMON(_at_)mydomain(_dot_)net" I want 
procmail to
use "MAILER-DAEMON(_at_)someotherdomain(_dot_)net". I took a look at the 
Procmail FAQ
but could not figure out a way to achieve this. Any help would be
appreciated. Thanks in advance.

-dnp