mx.henkel-ac.com has no CNAME records.
Question and response
Question
dig mx.henkel-ac.com. NS
Answer
The response has no answer records.
Authority
henkel-ac.com. 1854 SOA dns.henkel-ac.com. hostmaster.henkel-ac.com. 1276205794 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0