anycx3.irondns.de has no MX records.
Question and response
Question
dig anycx3.irondns.de. MX
Answer
The response has no answer records.
Authority
irondns.de. 86400 SOA ns2.knipp.de. dnsmaster.irondns.net. 2023092657 10800 3000 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0