_dmarc.efolder.net has no CNAME records.
Question and response
Question
dig _dmarc.efolder.net. NS
Answer
The response has no answer records.
Authority
efolder.net. 1788 SOA ns2.efscloud.net. domainadmin.efolder.net. 61 14400 600 3600000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0