software-mail.visp.net has no CNAME records.
Question and response
Question
dig software-mail.visp.net. NS
Answer
The response has no answer records.
Authority
visp.net. 301 SOA ns.visp.net. hostmaster.visp.net. 2026021902 3600 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0