dns2dns.ru has no MX records.
Question and response
Question
dig dns2dns.ru. MX
Answer
The response has no answer records.
Authority
dns2dns.ru. 3600 SOA ns1.dns2b.ru. hostmaster.dns2dns.ru. 2026021901 10800 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0