mta.dnsdrift.net has no CNAME records.
Question and response
Question
dig mta.dnsdrift.net. NS
Answer
The response has no answer records.
Authority
dnsdrift.net. 10800 SOA ns.dnsdrift.net. registry.exeo.se. 1764064339 3600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0