webmail.louhi.net has no CNAME records.
Question and response
Question
dig webmail.louhi.net. NS
Answer
The response has no answer records.
Authority
louhi.net. 2453 SOA dns1.louhi.net. hostmaster.louhi.net. 2024052358 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0