ns.cert.ee has no MX records.
Question and response
Question
dig ns.cert.ee. MX
Answer
The response has no answer records.
Authority
cert.ee. 3600 SOA ns.cert.ee. hostmaster.cert.ee. 2026021903 28800 7200 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0