mx.ALMATEL.RU has no CNAME records.
Question and response
Question
dig mx.ALMATEL.RU. NS
Answer
The response has no answer records.
Authority
ALMATEL.RU. 532 SOA ns1.ALMATEL.RU. noc.ALMATEL.RU. 2025102922 7200 3600 3600000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0