mx.blauw-digitaldesign.com has no CNAME records.
Question and response
Question
dig mx.blauw-digitaldesign.com. NS
Answer
The response has no answer records.
Authority
blauw-digitaldesign.com. 3392 SOA dns.blauw-digitaldesign.com. hostmaster.blauw-digitaldesign.com. 1377087694 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0