mail.ingenicoaccess.com has no CNAME records.
Question and response
Question
dig mail.ingenicoaccess.com. NS
Answer
The response has no answer records.
Authority
ingenicoaccess.com. 529 SOA auth0020.ns.eu.uu.net. hostmaster.uk.uu.net. 2021111902 28800 7200 2678400 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0