mx.isp.as2116.net has no CNAME records.
Question and response
Question
dig mx.isp.as2116.net. NS
Answer
The response has no answer records.
Authority
isp.as2116.net. 600 SOA ns01.no.brand.one.com. hostmaster.no.brand.one.com. 2026010702 14400 3600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0