mail-in.dsi.net has no MX records.
Question and response
Question
dig mail-in.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