Question and response
Question
dig external.smtprelay.rackspace.net. DS
Answer
The response has no answer records.
Authority
smtprelay.rackspace.net. 300 SOA ns.rackspace.com. hostmaster.rackspace.com. 1621630484 3600 300 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0