smtp.ppb.worldline-solutions.com has no MX records.
Question and response
Question
dig smtp-paperboy.csms.worldline-solutions.com. MX
Answer
The response has no answer records.
Authority
csms.worldline-solutions.com. 60 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1741646465 7200 7200 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0