mx1.prosodie.com has no NS records.
NS records for this zone are defined at prosodie.com.
NS records for this zone are defined at prosodie.com.
Question and response
Question
dig mx1.prosodie.com. NS
Answer
The response has no answer records.
Authority
prosodie.com. 60 SOA ns-607.awsdns-11.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0