ns2.netart.com has no MX records.
Question and response
Question
dig ns2.netart.com. MX
Answer
The response has no answer records.
Authority
netart.com. 3600 SOA ns1.netart.com. office.netart.com. 2008133200 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0