DNS question: Finding just my domain

[Joel Hammer]

I run a DNS on my local home network.

Everything works fine except that the domain name alone doesn't resolve
to anything, eg:

nslookup fred (a known member of mydomain)
works and gives fred.mydomain.com but:

nslookup mydomain.com  
doesn't give anything.

This confuses fetchmail, which refuses to deliver mail from a domain it
can't resolve.

I have solved this problem the brute force way, by just putting:

mydomain.com. A IN 192.168.1.6

into my configuration file, but this seems, well, how shall I say it,...
dumb?

Is there a proper way to configure my DNS to return an ip address when
just the domain name is requested?


Joel