smtp2c.consultorpc.com has no CNAME records.
Question and response
Question
dig smtp2c.consultorpc.com. NS
Answer
The response has no answer records.
Authority
consultorpc.com. 1570 SOA olga.ns.cloudflare.com. dns.cloudflare.com. 2398546540 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0