ns.allianz.com has no MX records.
Question and response
Question
dig ns.allianz.com. MX
Answer
The response has no answer records.
Authority
allianz.com. 10800 SOA ns.allianz.com. hostmaster.allianz.de. 2026030603 10800 1800 3600000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0