s2.netcompartner.com has no MX records.
Question and response
Question
dig s2.netcompartner.com. MX
Answer
The response has no answer records.
Authority
netcompartner.com. 38400 SOA s2.netcompartner.com. hostmaster.netcompartner.com. 1384763827 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0