n3.dns.ec has no MX records.
Question and response
Question
dig n3.dns.ec. MX
Answer
The response has no answer records.
Authority
dns.ec. 3600 SOA master.nic.ec. dnsadmin.nic.ec. 2020013382 21600 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0