exchange has no MX records.
Question and response
Question
dig exchange. MX
Answer
The response has no answer records.
Authority
exchange. 3600 SOA v0n0.nic.exchange. hostmaster.donuts.email. 1771992029 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0