inet.zelenadata.cz has no MX records.
Question and response
Question
dig inet.zelenadata.cz. MX
Answer
The response has no answer records.
Authority
zelenadata.cz. 3600 SOA inet.faster.cz. hostmaster.faster.cz. 2026012410 16384 2048 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0