ns1.dnshigh.com has no MX records.
Question and response
Question
dig ns1.dnshigh.com. MX
Answer
The response has no answer records.
Authority
dnshigh.com. 14400 SOA ns1.dnshigh.com. unixadmin.serverplan.com. 2026022200 86400 7200 3600000 14400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0