nmx4.worldline.com has no MX records.
Question and response
Question
dig nmx4.worldline.com. MX
Answer
The response has no answer records.
Authority
worldline.com. 3600 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2025032796 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0