namesserver.net has no MX records.
Question and response
Question
dig namesserver.net. MX
Answer
The response has no answer records.
Authority
namesserver.net. 86400 SOA ns1.nsserve.de. ns1.nsserve.de. 2003071821 40000 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0