zimbra.relaix.net has no NS records.
NS records for this zone are defined at relaix.net.
NS records for this zone are defined at relaix.net.
Question and response
Question
dig zimbra.relaix.net. NS
Answer
The response has no answer records.
Authority
relaix.net. 1800 SOA ns1.relaix.net. noc.relaix.net. 1774199003 14400 7200 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0