box.domaku.com has no MX records.
Question and response
Question
dig box.domaku.com. MX
Answer
The response has no answer records.
Authority
domaku.com. 3600 SOA ns1.nodoxy.com. hostmaster.domaku.com. 2026021901 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0