generate tsig key
tsig-keygen -a HMAC-SHA512 galileo-tsig-key
enable rfc2136 updates on domain in /etc/bind/named.conf.local
zone "nawigare.it" { ...... // this is for certbot check-names warn; update-policy { grant galileo-tsig-key name _acme-challenge.nawigare.it. txt; }; };
named-checkzone -D csgalileo.org csgalileo.org.hosts
Start with https://docs.iredmail.org/setup.dns.html