mail.test1-cs900.awk.jp has no CNAME records.
Question and response
Question
dig mail.test1-cs900.awk.jp. NS
Answer
The response has no answer records.
Authority
test1-cs900.awk.jp. 3453 SOA ns.test1-cs900.awk.jp. nobuhiro\.inaguma.rakus.co.jp. 2023012003 14400 60 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0