notify.avantel.ru has no MX records.
Question and response
Question
dig billing-web.avantel.ru. MX
Answer
The response has no answer records.
Authority
avantel.ru. 3600 SOA ns.avantel.ru. support.avantel.ru. 2026021204 3600 1800 43200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0