erde.gensonline.eu has no MX records.
Question and response
Question
dig erde.gensonline.eu. MX
Answer
The response has no answer records.
Authority
gensonline.eu. 60 SOA moon.gensonline.eu. rainer.gensonline.eu. 172258 1800 600 3600000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0