cloud.bzsrv.de has no MX records.
Question and response
Question
dig cloud.bzsrv.de. MX
Answer
The response has no answer records.
Authority
bzsrv.de. 60 SOA hydrogen.ns.hetzner.com. dns.hetzner.com. 2025122601 86400 10800 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0