east.smtp.mx.exch030.serverdata.net has no CNAME records.
Question and response
Question
dig east.smtp.mx.exch030.serverdata.net. NS
Answer
The response has no answer records.
Authority
exch030.serverdata.net. 1086 SOA ns2.serverdata.net. hostmaster.serverdata.net. 2026012104 3600 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0