ns18.achinsk.net has no MX records.
Question and response
Question
dig ns18.achinsk.net. MX
Answer
The response has no answer records.
Authority
achinsk.net. 3600 SOA ns1.achinsk.net. sint.achmail.ru. 2025061601 10800 900 1814400 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0