idcfsend02.mailsend.idc.jp has no CNAME records.
Question and response
Question
dig idcfsend02.mailsend.idc.jp. NS
Answer
The response has no answer records.
Authority
mailsend.idc.jp. 3140 SOA ns01.idcfcloud.com. svope.idcf.jp. 139 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0