DNS

galileo

https://apps.db.ripe.net

MNTNER name: MNT-CSGALILEO

prettier

named-checkzone -D csgalileo.org csgalileo.org.hosts

reverse

https://www.ripe.net/manage-ips-and-asns/db/support/configuring-reverse-dns

DMARC

Start with https://docs.iredmail.org/setup.dns.html