mx1.lexsynergy.net has no CNAME records.
Question and response
Question
dig mx1.lexsynergy.net. NS
Answer
The response has no answer records.
Authority
lexsynergy.net. 300 SOA ns01.lexsynergy.net. dnsmaster.lexsynergy.net. 2011075611 604800 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0