dns-auth2.uni-stuttgart.edu has no MX records.
Question and response
Question
dig dns-auth2.uni-stuttgart.edu. MX
Answer
The response has no answer records.
Authority
uni-stuttgart.edu. 3600 SOA dns-hm0.rus.uni-stuttgart.de. dns-support.rus.uni-stuttgart.de. 2026021607 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0