mta-poolcons.cluster2.convio.net has no CNAME records.
Question and response
Question
dig mta-poolcons.cluster2.convio.net. NS
Answer
The response has no answer records.
Authority
convio.net. 1432 SOA dns1.convio.net. netadmin.convio.com. 2026021901 1800 300 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0