ns4.spin.ee has no MX records.
Question and response
Question
dig ns4.spin.ee. MX
Answer
The response has no answer records.
Authority
spin.ee. 3600 SOA ns4.spin.ee. hostmaster.spin.ee. 2026021704 3600 600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0