mx01.mailsecurity.fr has no NS records.
NS records for this zone are defined at mailsecurity.fr.
NS records for this zone are defined at mailsecurity.fr.
Question and response
Question
dig mx01.cloud.vadesecure.com. NS
Answer
The response has no answer records.
Authority
cloud.vadesecure.com. 900 SOA ns-1699.awsdns-20.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0