mail2.data393.net has no CNAME records.
Question and response
Question
dig mail2.data393.net. NS
Answer
The response has no answer records.
Authority
data393.net. 3341 SOA ns1.dfw.databank.com. ipadmin.databank.com. 2025042000 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0