spf-intern.codepiraten.com has no MX records.
Question and response
Question
dig spf-intern.codepiraten.com. MX
Answer
The response has no answer records.
Authority
codepiraten.com. 86400 SOA ns1.first-ns.de. dns.hetzner.com. 2026022210 14400 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0