mail.k8.lv has no CNAME records.
Question and response
Question
dig mail.k8.lv. NS
Answer
The response has no answer records.
Authority
lv. 1800 SOA a.nic.lv. dns.nic.lv. 1772815805 3600 900 1296000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0