mailrelay.vse.de has no MX records.
Question and response
Question
dig mailrelay.vse.de. MX
Answer
The response has no answer records.
Authority
vse.de. 3600 SOA ns1.vsenet.net. hostmaster.vsenet.net. 2026012101 28800 3600 1728000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0