x1.si has no MX records.
Question and response
Question
dig x1.si. MX
Answer
The response has no answer records.
Authority
x1.si. 1800 SOA x1.si. dns.resolve.si. 4 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0