mx.GOSUSLUGI.RU has no CNAME records.
Question and response
Question
dig mx.GOSUSLUGI.RU. NS
Answer
The response has no answer records.
Authority
GOSUSLUGI.RU. 578 SOA ns1.GOSUSLUGI.RU. support-egov.rtlabs.RU. 2026022702 600 7200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0