I don't think I understand an error reported by zonecheck. Here is the
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 22.214.171.124
What does this message mean? Is it a bug in zonecheck, or is there
zonecheck-tests mailing list