intranet.demandware.net has no MX records.
Question and response
Question
dig intranet.demandware.net. MX
Answer
The response has no answer records.
Authority
demandware.net. 60 SOA dns01.salesforce.com. hostmaster.salesforce.com. 2014748677 600 900 2592000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0