Question and response
Question
dig smtp.combellgroup.com. NSEC
Answer
The response has no answer records.
Authority
combellgroup.com. 3600 SOA ns3.combell.net. hostmaster.combellgroup.com. 1754777819 10800 3600 604800 40000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0