sslmail.inttech.de has no CNAME records.
Question and response
Question
dig sslmail.inttech.de. NS
Answer
The response has no answer records.
Authority
inttech.de. 199 SOA ns.inttech.de. info.int-tech.de. 2026022601 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0