mailspool.easycruit.com has no NS records.
NS records for this zone are defined at easycruit.com.
NS records for this zone are defined at easycruit.com.
Question and response
Question
dig mailspool.easycruit.com. NS
Answer
The response has no answer records.
Authority
easycruit.com. 900 SOA ns-1222.awsdns-24.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0