ns2.mailernet.work has no CNAME records.
Question and response
Question
dig ns2.mailernet.work. NS
Answer
The response has no answer records.
Authority
mailernet.work. 1800 SOA ns1.mailernet.work. secure757.mailernet.work. 2026010502 7200 3600 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0