smtp-out.spoje.net has no MX records.
Question and response
Question
dig smtp-out.spoje.net. MX
Answer
The response has no answer records.
Authority
spoje.net. 3600 SOA ns.spoje.net. tech.spoje.net. 1771956096 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0