mail.awk.jp has no CNAME records.
Question and response
Question
dig mail.awk.jp. NS
Answer
The response has no answer records.
Authority
awk.jp. 485 SOA ns.awk.jp. xunit-support.rakus.co.jp. 2026011804 14400 60 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0