asmtp.lynero.net has no CNAME records.
Question and response
Question
dig asmtp.lynero.net. NS
Answer
The response has no answer records.
Authority
lynero.net. 535 SOA ns.lynero.net. hostmaster.lynero.net. 2026030503 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0