mail.setxrm.com has no CNAME records.
Question and response
Question
dig mail.setxrm.com. NS
Answer
The response has no answer records.
Authority
setxrm.com. 1692 SOA sean.ns.cloudflare.com. dns.cloudflare.com. 2397326347 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0