mailhost.cylande.com has no NS records.
NS records for this zone are defined at cylande.com.
NS records for this zone are defined at cylande.com.
Question and response
Question
dig mailhost.cylande.com. NS
Answer
The response has no answer records.
Authority
cylande.com. 10800 SOA ns0.eolas.fr. hostmaster.eolas.fr. 2025111408 86400 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0