Sendmail relaying for Intranet?

[Chris Maness]

I have a FreeBSD box running sendmail that can see the whole internet.
 I have another mail server that hosts mail for an intranet.  It does
not have access to the i-net.  I think I remember reading that it is
possible for the i-net attached sendmail to relay mail for a domain to
another host.  Is there an easy answer and configuration for this?  If
not, no biggy since this exercise is more academic than a necessity.

Thanks,
Chris Maness