Question and response
Question
dig mxbackend.netaddress.usa.net. KEY
Answer
The response has no answer records.
Authority
netaddress.usa.net. 3600 SOA cndvg001.usa.net. hostmaster.usa.net. 2008120800 1800 600 604800 3600
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0