pearson.savvis.net has no MX records.
Question and response
Question
dig pearson.savvis.net. MX
Answer
The response has no answer records.
Authority
pearson.savvis.net. 3600 SOA ns6a.savvis.net. dns-admin.centurylink.com. 2191106000 3600 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0