email.doppiozero.to has no MX records.
Question and response
Question
dig email.doppiozero.to. MX
Answer
The response has no answer records.
Authority
doppiozero.to. 60 SOA ns1.systemdns.com. hostmaster.systemdns.com. 1769089463 10800 3600 1209600 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0