mail.az-ix.net has no CNAME records.
Question and response
Question
dig mail.az-ix.net. NS
Answer
The response has no answer records.
Authority
az-ix.net. 10800 SOA ns01.azersat.com. support.datacenter.az. 2026030201 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0