lon5.omniture.com has no MX records.
Question and response
Question
dig lon5.omniture.com. MX
Answer
The response has no answer records.
Authority
lon5.omniture.com. 60 SOA ns101.adobe.net. dnsadmin.omniture.com. 1627 21600 3600 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0