_dc-mx.e3b4fcd87ead.prodns.mx has no MX records.
Question and response
Question
dig _dc-mx.e3b4fcd87ead.prodns.mx. MX
Answer
The response has no answer records.
Authority
prodns.mx. 1800 SOA jessica.ns.cloudflare.com. dns.cloudflare.com. 2396178825 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0