MX record lookup problem.

[Grahame Cooper]

I have a domain name jandg-cooper.com registered with Enom.

jandg-cooper.com does not refer to any host, so there is no A or CNAME 
record for that, but there is an MX record for jandg-cooper.com, which 
points to cooper-linux.jandg-cooper.com

The problem is that if an MX query for jandg-cooper is preceded by an A 
record query, then the MX query fails:

  $ host -t MX jandg-cooper.com
  jandg-cooper.com mail is handled by 10 cooper-linux.jandg-cooper.com.

  $ host jandg-cooper.com
  Host jandg-cooper.com not found: 3(NXDOMAIN)

  $ host cooper-linux.jandg-cooper.com
  cooper-linux.jandg-cooper.com has address 213.106.40.103

  $ host -t MX jandg-cooper.com
  Host jandg-cooper.com not found: 3(NXDOMAIN)

I'm not sure whether this is a problem with Bind or Enom.

Any clues?