mx1.NOVOTELECOM.RU has no CNAME records.
Question and response
Question
dig mx1.NOVOTELECOM.RU. NS
Answer
The response has no answer records.
Authority
novotelecom.ru. 5079 SOA ns.novotelecom.ru. hostmaster.inetra.ru. 2026022000 28800 3600 28800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0