Question and response
Question
dig smtp01.us-west-2.mail-perimeter.amazon.com. NXT
Answer
The response has no answer records.
Authority
us-west-2.mail-perimeter.amazon.com. 900 SOA ns-1096.awsdns-09.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0