cannot resolve domain.com in nslookup

[Damon Haas]

ok- I posted earlier and this could be the problem... I want people in my
company to be able to receive their mail ad user at domain.com instead of
user at host.domain.com when I use nslookup to check host.domain.com it comes
up just time with the IP address. when I use nslookup to check domain.com it
comes back as a non-existent host/domain.  is this correct or is this an
error?

Damon Haas