I run sendmail + pop3 in redhat 7.2

I want to setup catch-all.  So in the case of someone sending to a user
that does not exist @ my domain a default person such as postmaster
receives this instead.
 
I run sendmail version sendmail-8.11.6-3
 
procmail-3.21-1
 
 
Am i on the right mailling list ? or should I be talking to sendmail ?
 
ANy help would be appreciated.
 
Cheers
 
Ben M