spoje--net.mx.spoje.net has no MX records.
Question and response
Question
dig spoje--net.mx.spoje.net. MX
Answer
The response has no answer records.
Authority
mx.spoje.net. 1800 SOA ns.spoje.net. tech.spoje.net. 1771956156 1800 3600 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0