ns2.dnai.com has no MX records.
Question and response
Question
dig ns2.dnai.com. MX
Answer
The response has no answer records.
Authority
dnai.com. 300 SOA master.dns.rcn.net. hostmaster.rcn.com. 2026022201 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0