core.headline.com has no MX records.
Question and response
Question
dig core.headline.com. MX
Answer
The response has no answer records.
Authority
core.headline.com. 172800 SOA ns1.he.net. hostmaster.he.net. 2025120401 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0