mail.netlog.pl has no CNAME records.
Question and response
Question
dig mail.netlog.pl. NS
Answer
The response has no answer records.
Authority
netlog.pl. 3544 SOA ns1.netlog.pl. admin.netlog.pl. 2026022002 7200 540 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0