shared-adh249.rev.netart.com has no MX records.
Question and response
Question
dig shared-adh249.rev.netart.com. MX
Answer
The response has no answer records.
Authority
rev.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