Host123.lionbridge.com has no MX records.
Question and response
Question
dig Host123.lionbridge.com. MX
Answer
The response has no answer records.
Authority
lionbridge.com. 7200 SOA ns2.lionbridge.com. dns-admin.lionbridge.com. 2014064111 43200 7200 1296000 7200
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0