https://www.web-workers.ch/index.php/2021/11/20/how-to-install-migrate-sendmail-procmail-spamassassin-dovecot-opendkim-bind-apache-mariadb-egroupware-bind-on-from-centos7-to-rocky-linux-8/
How to install|migrate sendmail / procmail / spamassassin / dovecot / opendkim / bind / apache / mariadb / egroupware / bind on|from CentOS7 to Rocky Linux 8