mtmail.telia.lt has no CNAME records.
Question and response
Question
dig mtmail.telia.lt. NS
Answer
The response has no answer records.
Authority
telia.lt. 1800 SOA cash.ns.cloudflare.com. dns.cloudflare.com. 2398121014 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0