outgoing.pod92.demandware.net has no MX records.
Question and response
Question
dig outgoing.pod92.demandware.net. MX
Answer
The response has no answer records.
Authority
demandware.net. 60 SOA dns01.salesforce.com. hostmaster.salesforce.com. 2014748425 600 900 2592000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0