bqp.uni-konstanz.de has no MX records.
Question and response
Question
dig bqp.uni-konstanz.de. MX
Answer
The response has no answer records.
Authority
bqp.uni-konstanz.de. 3600 SOA ns3.uni-konstanz.de. hostmaster.uni-konstanz.de. 759148215 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0