mx-1.tele2.ee has no CNAME records.
Question and response
Question
dig mx-1.tele2.ee. NS
Answer
The response has no answer records.
Authority
tele2.ee. 986 SOA ns.tele2.ee. hostmaster.tele2.ee. 2026022303 1800 900 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0