mail.standart62.com has no CNAME records.
Question and response
Question
dig mail.standart62.com. NS
Answer
The response has no answer records.
Authority
standart62.com. 300 SOA ns1.beget.com. hostmaster.beget.com. 1761003524 300 600 86400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0