dns1.infoserve.de has no MX records.
Question and response
Question
dig dns1.infoserve.de. MX
Answer
The response has no answer records.
Authority
infoserve.de. 3598 SOA dns1.infoserve.de. hostmaster.infoserve.de. 2026021207 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0