betty.dnshigh.com has no MX records.
Question and response
Question
dig betty.dnshigh.com. MX
Answer
The response has no answer records.
Authority
dnshigh.com. 14400 SOA ns1.dnshigh.com. unixadmin.serverplan.com. 2026030709 86400 7200 3600000 14400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0