auth-ext0.DNS.techfak.net has no MX records.
Question and response
Question
dig auth-ext0.DNS.techfak.net. MX
Answer
The response has no answer records.
Authority
TechFak.NET. 3600 SOA dns.TechFak.NET. hostmaster.TechFak.NET. 2026022503 86400 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0