z21.nodoxy.com has no MX records.
Question and response
Question
dig z21.nodoxy.com. MX
Answer
The response has no answer records.
Authority
nodoxy.com. 3570 SOA ns1.nodoxy.com. hostmaster.nodoxy.com. 2026030501 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0