dius.uni-paderborn.de has no MX records.
Question and response
Question
dig dius.uni-paderborn.de. MX
Answer
The response has no answer records.
Authority
uni-paderborn.de. 1800 SOA dius.uni-paderborn.de. hostmaster.uni-paderborn.de. 767262879 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0