chemnitz.nic.xlink.net has no MX records.
Question and response
Question
dig chemnitz.nic.xlink.net. MX
Answer
The response has no answer records.
Authority
nic.xlink.net. 86400 SOA karlsruhe.nic.xlink.net. hostmaster.xlink.net. 2016080100 86400 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0