mx.lexsynergy.com has no MX records.
Question and response
Question
dig mx.lexsynergy.com. MX
Answer
The response has no answer records.
Authority
lexsynergy.com. 600 SOA ns01.lexsynergy.com. dnsmaster.lexsynergy.com. 2011076284 86400 3600 1209600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0