mail.smart-weblications.de has no CNAME records.
Question and response
Question
dig mail.smart-weblications.de. NS
Answer
The response has no answer records.
Authority
smart-weblications.de. 3155 SOA ns1.smart-weblications.de. hostmaster.smart-weblications.de. 2026021601 10800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0