mx6.madhoster.com has no MX records.
Question and response
Question
dig hosting6.madhoster.com. MX
Answer
The response has no answer records.
Authority
madhoster.com. 3600 SOA nserver1.madhoster.com. hostmaster.madhoster.com. 2014040277 10800 3600 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0