[zonecheck-tests] Not able to find MX record?

[Shane Kerr]

All,

I don't think I understand an error reported by zonecheck. Here is the
report:

 The IP address of the Mail eXchanger can't be resolved

    * The MX mxbackup.gradwell.net. representing the host name doesn't
      have an IP address.

Yet it really does have an IP address:

  $ host mxbackup.gradwell.net.
  mxbackup.gradwell.net has address 193.111.201.135

What does this message mean? Is it a bug in zonecheck, or is there
something wrong?

--
Shane