: Sendmail does not inherently depend on DNS.  You can use the 
: 	FEATURE(nodns)
: directive in your <foobar>.mc file.
: 
: See /usr/src/usr.sbin/sendmail/cf/README for full details.

There was a diuscussion on this very topic (and several others like
local source hacks) in freebsd-hackers lately...  Might want to check
the archives at www.freebsd.org in case my memory here is faulty.

To summarize: There was someone who had a UUCP system that reported
that he had to add FEATURE(nocannon) as well.  nodns really should be
named nomx, since it only disabled mx lookups.

Warner