srv12.core.toomanynodes.eu has no MX records.
Question and response
Question
dig srv12.core.toomanynodes.eu. MX
Answer
The response has no answer records.
Authority
toomanynodes.eu. 1800 SOA buck.ns.cloudflare.com. dns.cloudflare.com. 2397270058 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0