_spf3.allianz.de has no MX records.
Question and response
Question
dig _spf3.allianz.de. MX
Answer
The response has no answer records.
Authority
allianz.de. 10800 SOA ns.allianz.com. hostmaster.allianz.com. 2026030900 10800 1800 3600000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0