nic.berlin has no MX records.
Question and response
Question
dig nic.berlin. MX
Answer
The response has no answer records.
Authority
nic.berlin. 30 SOA sec1.rcode0.net. ops.nic.at. 2026013434 10800 3600 604800 30
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0