Error message in .qmail

[Jan Stanik]

Hi,

        I have this line in .qmail-default file:

| [ "$HOST" = "domain.sk" ] && exit 100 || exit 0

which returns a "hard error" message to the sender, if host domain 
is "domain.sk". What I need is put to that message exact reason 
of undelivery (e.g. "User uknown"). How can I do that?