_dmarc.xlhost.com has no CNAME records.
Question and response
Question
dig _dmarc.xlhost.com. NS
Answer
The response has no answer records.
Authority
xlhost.com. 10623 SOA dns4.ee.net. hostmaster.ee.net. 2017030854 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0