mx00.netplace.com has no CNAME records.
Question and response
Question
dig mx00.netplace.com. NS
Answer
The response has no answer records.
Authority
netplace.com. 554 SOA dns0.noris.net. hostmaster.noris.net.netplace.com. 1771849624 86400 86400 2419200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0