ms2.dempseyclark.com has no MX records.
Question and response
Question
dig ms2.dempseyclark.com. MX
Answer
The response has no answer records.
Authority
dempseyclark.com. 300 SOA ns1.dacc.cz. domains.dacc.cz. 2025050901 60 30 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0