postfix.esaas.inmoment.com has no NS records.
NS records for this zone are defined at esaas.inmoment.com.
NS records for this zone are defined at esaas.inmoment.com.
Question and response
Question
dig postfix.esaas.inmoment.com. NS
Answer
The response has no answer records.
Authority
esaas.inmoment.com. 900 SOA ns-223.awsdns-27.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0