mailserv.eflyermarketing.co has no CNAME records.
Question and response
Question
dig mailserv.eflyermarketing.co. NS
Answer
The response has no answer records.
Authority
co. 409 SOA ns0.centralnic.net. hostmaster.centralnic.net. 1759592197 900 1800 6048000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0