_spf.creoline.de has no MX records.
Question and response
Question
dig _spf.creoline.de. MX
Answer
The response has no answer records.
Authority
creoline.de. 3600 SOA ns1.creoline.net. noc.creoline.com. 2026021602 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0