mx.synacordomains.net has no NS records.
NS records for this zone are defined at synacordomains.net.
NS records for this zone are defined at synacordomains.net.
Question and response
Question
dig mx.synacordomains.net. NS
Answer
The response has no answer records.
Authority
synacordomains.net. 3600 SOA dns1.name-services.com. info.name-services.com. 1644677301 172800 900 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0