eu1.intgdc.com has no MX records.
Question and response
Question
dig eu1.intgdc.com. MX
Answer
The response has no answer records.
Authority
eu1.intgdc.com. 60 SOA dns1.p03.nsone.net. hostmaster.nsone.net. 1653485973 600 300 1209600 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0