ldgw.razorfish.com has no MX records.
Question and response
Question
dig ldgw.razorfish.com. MX
Answer
The response has no answer records.
Authority
razorfish.com. 900 SOA ns1.publicisgroupe.com. network\.support.us-resources.com. 318705342 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0