mailout01.wer-gmbh.de has no MX records.
Question and response
Question
dig mailout01.wer-gmbh.de. MX
Answer
The response has no answer records.
Authority
wer-gmbh.de. 3600 SOA ns1.your-server.de. postmaster.your-server.de. 2026010900 86400 10800 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0