mx-relay.msfiber.net has no CNAME records.
Question and response
Question
dig mx-relay.msfiber.net. NS
Answer
The response has no answer records.
Authority
msfiber.net. 3119 SOA ddi-ind1.msfiber.net. administrator.msfiber.net. 2024051885 3600 3600 3600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0