informatik.tu-muenchen.de has no MX records.
Question and response
Question
dig informatik.tu-muenchen.de. MX
Answer
The response has no answer records.
Authority
informatik.tu-muenchen.de. 3600 SOA ns1.rbg.tum.de. postmaster.rbg.tum.de. 1500213931 21600 1800 360000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0