siemens.de has no MX records.
Question and response
Question
dig siemens.de. MX
Answer
The response has no answer records.
Authority
siemens.de. 300 SOA a1-16.akam.net. hostmaster.siemens.com. 2026022420 3600 600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0