Is any else successfully using the "twist" option to TCP wrappers?

I'd like to use it to control the rejection message for sendmail, but 
I can't figure it out. If I put ": twist /bin/echo ...." after 
"sendmail: ALL except ... " in "hosts.allow", it seems to reject 
everything with the twist message *except* the exceptions. If I have 
no entry for "sendmail" in "hosts.allow", but have "sendmail: ... : 
twist ...", everything gets rejected with a generic message (contrary 
to the docs), but if I add "sendmail: ALL" to "hosts.allow", then 
everything would get accepted, wouldn't it?

The point is that "/etc/mail/access" doesn't let you use CIDR, while 
TCP wrappers does. If anyone is doing this, could you please post an 
example configuration?

Thanks in advance,


Frederick