mail2.kupredu.net has no MX records.
Question and response
Question
dig mail2.kupredu.net. MX
Answer
The response has no answer records.
Authority
kupredu.net. 3600 SOA ns.forpsi.net. admin.forpsi.net. 2026021001 14400 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0