grpotencial.entregaemail.com has no MX records.
Question and response
Question
dig grpotencial.entregaemail.com. MX
Answer
The response has no answer records.
Authority
entregaemail.com. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2398035836 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0