thenorth-com.p10.spamhero.com has no MX records.
Question and response
Question
dig thenorth-com.p10.spamhero.com. MX
Answer
The response has no answer records.
Authority
thenorth-com.p10.spamhero.com. 86400 SOA ns.dnsbox.net. hostmaster.dnsbox.net. 2018112702 10000 3600 604800 172800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0