ns1.sandbox.global.ingenico.com has no MX records.
Question and response
Question
dig ns1.sandbox.global.ingenico.com. MX
Answer
The response has no answer records.
Authority
sandbox.global.ingenico.com. 60 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1740490272 7200 7200 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0