Why does a name server send no MX records?

[Mark.Andrews at nominum.com]

	The SOA is in the authority section.  This is a negative answer.
	The nameserver is working correctly.  Your MTA is also working
	correctly.

	Mark
> 
> There are some situations when a name server does not send MX records
> for an MX query and sends SOA records.   Is it supposed to be a rare
> case, or is it okay if happens often?
> 
> Thanks
> 
> 
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com