smtp.uni-ulm.de has no MX records.
Question and response
Question
dig smtp.uni-ulm.de. MX
Answer
The response has no answer records.
Authority
uni-ulm.de. 3600 SOA dns1.uni-ulm.de. hostmaster.uni-ulm.de. 2026022718 21600 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0