zimbra.dc.volia.com has no NS records.
NS records for this zone are defined at dc.volia.com.
NS records for this zone are defined at dc.volia.com.
Question and response
Question
dig zimbra.dc.volia.com. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0