ns2.deltatelesystems.ru has no MX records.
Question and response
Question
dig ns2.deltatelesystems.ru. MX
Answer
The response has no answer records.
Authority
deltatelesystems.ru. 3600 SOA ns1.deltatelesystems.ru. admin.oborona.net. 2024110501 86400 86400 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0