mx3.versatel.net has no CNAME records.
Question and response
Question
dig mx3.versatel.net. NS
Answer
The response has no answer records.
Authority
versatel.net. 1149 SOA ns1.versatel.net. hostmaster.versatel.net. 2024051501 10800 3600 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0