mail.microhost.pl has no CNAME records.
Question and response
Question
dig mail.microhost.pl. NS
Answer
The response has no answer records.
Authority
microhost.pl. 3599 SOA ns1.microhost.pl. hostmaster.microhost.pl. 2026030200 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0