ns.barnaul.avantel.ru has no MX records.
Question and response
Question
dig ns.barnaul.avantel.ru. MX
Answer
The response has no answer records.
Authority
barnaul.avantel.ru. 3600 SOA ns.barnaul.avantel.ru. support.avantel.ru. 2025020516 3600 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0