mail.intergenia.de has no MX records.
Question and response
Question
dig mail.hosteurope.de. MX
Answer
The response has no answer records.
Authority
mail.hosteurope.de. 3600 SOA cns3.secureserver.net. dns.jomax.net. 2024071600 26800 7200 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0