router.owei.net has no MX records.
Question and response
Question
dig weda.dynamdns.de. MX
Answer
The response has no answer records.
Authority
dynamdns.de. 60 SOA ns.owe.de. hostmaster.owe.de. 5128 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0