smtprelay.croisieres.fr has no NS records.
NS records for this zone are defined at croisieres.fr.
NS records for this zone are defined at croisieres.fr.
Question and response
Question
dig smtprelay.croisieres.fr. NS
Answer
The response has no answer records.
Authority
croisieres.fr. 900 SOA ns-1517.awsdns-61.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0