216-151-252-0.client.dsl.net has no MX records.
Question and response
Question
dig 216-151-252-0.client.dsl.net. MX
Answer
The response has no answer records.
Authority
client.dsl.net. 300 SOA ns1.megapath.net. support.megapath.net. 1372209790 14400 3600 2718281828 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0