ns3.2gis.RU has no MX records.
Question and response
Question
dig ns3.2gis.RU. MX
Answer
The response has no answer records.
Authority
2gis.RU. 1800 SOA ns.2gis.RU. hostmaster.2gis.RU. 2026030251 1200 300 2592000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0