pdxsmtp.mcshosts.net has no NS records.
NS records for this zone are defined at mcshosts.net.
NS records for this zone are defined at mcshosts.net.
Question and response
Question
dig pdxsmtp.mcshosts.net. NS
Answer
The response has no answer records.
Authority
mcshosts.net. 900 SOA ns-1069.awsdns-05.org. awsdns-hostmaster.amazon.com. 1 3600 600 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0