mx2.netpulseconnect.com has no CNAME records.
Question and response
Question
dig mx2.netpulseconnect.com. NS
Answer
The response has no answer records.
Authority
netpulseconnect.com. 229 SOA x.ns.joker.com. hostmaster.joker.com. 2024092653 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0