node-stack.yc.hn has no MX records.
Question and response
Question
dig node-stack.yc.hn. MX
Answer
The response has no answer records.
Authority
yc.hn. 1800 SOA ns.yc.hn. webmaster.yc.hn. 1769539642 3600 600 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0