dns3.eninetworks.com has no MX records.
Question and response
Question
dig dns3.eninetworks.com. MX
Answer
The response has no answer records.
Authority
eninetworks.com. 3600 SOA dns.eninetworks.com. hostmaster.eninetworks.com. 2008101324 43200 720 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0