add domain to postmin

add accounts and aliases to postmin

add domain to openDKIM (KeyTable, SigningTable, TrustedHosts)

mkdir /etc/opendkim/keys/yourdomain.com

opendkim-genkey -b 1024 -d yourdomain.com -D /etc/opendkim/keys/yourdomain.com -s 20250101 -v

chown opendkim:opendkim /etc/opendkim/keys -R

cat chown opendkim:opendkim /etc/opendkim/keys/yourdomain.com/20250101.txt

create txt DNS record for yourdomain.com at registrar

add yourdomain.com to /var/spool/amavis/local_domains