smtpav0.hosteam.fr has no NS records.
NS records for this zone are defined at hosteam.fr.
NS records for this zone are defined at hosteam.fr.
Question and response
Question
dig smtpav0.hosteam.fr. NS
Answer
The response has no answer records.
Authority
hosteam.fr. 0 SOA ns1.cyres.fr. root.cyres.fr. 0 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0