rdir.vip.inxserver.de has no MX records.
Question and response
Question
dig rdir.vip.inxserver.de. MX
Answer
The response has no answer records.
Authority
inxserver.de. 300 SOA ns1.bringe.net. hostmaster.bringe.com. 2024110600 86400 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0