ns.domrobot.org has no MX records.
Question and response
Question
dig ns.domrobot.org. MX
Answer
The response has no answer records.
Authority
domrobot.org. 3600 SOA ns.domrobot.com. hostmaster.inwx.de. 2026020313 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0