ns3.1blu-dns.net has no MX records.
Question and response
Question
dig ns3.1blu-dns.net. MX
Answer
The response has no answer records.
Authority
1blu-dns.net. 3600 SOA ns1.1blu-dns.de. hostmaster.1blu.de. 2012102201 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0