mail.tec4u-solutions.com has no CNAME records.
Question and response
Question
dig mail.tec4u-solutions.com. NS
Answer
The response has no answer records.
Authority
tec4u-solutions.com. 1755 SOA ns.internet1.de. hostmaster.centron.de. 2026030402 3600 900 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0