ns1.preprod.global.ingenico.com has no MX records.
Question and response
Question
dig ns1.preprod.global.ingenico.com. MX
Answer
The response has no answer records.
Authority
preprod.global.ingenico.com. 60 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1740498283 7200 7200 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0