mail.connected.pl has no CNAME records.
Question and response
Question
dig mail.connected.pl. NS
Answer
The response has no answer records.
Authority
connected.pl. 10463 SOA ns2.e-vps.pl. p\.siwicki.connected.pl. 2026021099 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0