listmail.cgs-cimb.com has no CNAME records.
Question and response
Question
dig listmail.cgs-cimb.com. NS
Answer
The response has no answer records.
Authority
cgs-cimb.com. 300 SOA dns1. hostmaster. 680 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0