Bouncing of mails

Hello group,

        I have some set of users in my procmailrc. 

my procmailrc file looks like this

:0 h b
* ^To.*johnson
| formail -A "X-Loop : Forwarded" | \
$SENDMAIL -oi johnson(_at_)yahoo(_dot_)com

:0 h b
* ^To.*admin
| formail -A "X-Loop : Forwarded" | \
$SENDMAIL -oi admin(_at_)yahoo(_dot_)com

if i send a mail to johnson(_at_)localhost then the mail should be forwarded
to johnson(_at_)yahoo(_dot_)com(_dot_) Same should happen for  user admin also. 
if i send a
mail to junk(_at_)localhost(non existing user) then the mail should bounce. how
do i configure this.

Please let me know? 

thanks in advance

- john

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