zone has no MX records.
Question and response
Question
dig zone. MX
Answer
The response has no answer records.
Authority
zone. 3600 SOA v0n0.nic.zone. hostmaster.donuts.email. 1771883055 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0