mail.dsi.net has no MX records.
Question and response
Question
dig mail.dsi.net. MX
Answer
The response has no answer records.
Authority
dsi.net. 3600 SOA ns.dsinet.eu. hostmaster.dsi.net. 2026022200 28800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0