Question and response
Question
dig amazon-smtp.amazon.com. KX
Answer
The response has no answer records.
Authority
amazon-smtp.amazon.com. 900 SOA ns-1471.awsdns-55.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0