mail2.1GL.RU has no CNAME records.
Question and response
Question
dig mail2.1GL.RU. NS
Answer
The response has no answer records.
Authority
1GL.RU. 300 SOA ns1.fr.RU. internet.action-media.RU. 2022100401 14400 180 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0