Roundcube

EL 8 & 9 should already have roundcubemail installed, otherwise...
 # dnf -y install epel-release
 # dnf config-manager --set-enabled powertools
 # dnf -y install https://rpms.remirepo.net/enterprise/remi-release-8.rpm
 # dnf -y module reset php
 # dnf module install php:remi-8.1
 # yum -y install git yum-utils epel-release php-mysql roundcubemail
 # mysql --defaults-extra-file=$credfile -e "create database roundcube character set utf8 collate utf8_bin"
 # mysql --defaults-extra-file=$credfile -e "CREATE USER roundcube@localhost IDENTIFIED BY 'p4ssw3rd'"
 # mysql --defaults-extra-file=$credfile -e "GRANT ALL PRIVILEGES ON roundcube.* TO roundcube@localhost"
 # mysql --defaults-extra-file=$credfile roundcube < /usr/share/roundcubemail/SQL/mysql.initial.sql
 # cp -p /etc/httpd/conf.d/roundcubemail.conf /etc/httpd/conf.d/roundcubemail.conf.bak
 # wget -O /etc/roundcubemail/config.inc.php http://www.qmailtoaster.org/rc.default.config.rhelgt7
 # wget -O /etc/httpd/conf.d/roundcubemail.conf http://www.qmailtoaster.org/rc.httpd.config
 # sed -i 's/\;date.timezone.*/date.timezone = "America\/Denver"/' /etc/php.ini | sleep 2 | cat /etc/php.ini | grep date.timezone.*=
 # systemctl restart httpd

Access https://my.roundcube.server/email

Add password support (Everyone should logout of roundcube at this point)
[vpopmaild]
 # wget -O /usr/share/roundcubemail/plugins/password/config.inc.php http://www.qmailtoaster.org/rc.password.config
 # [ "`grep \'password\', /etc/roundcubemail/config.inc.php`" = "" ] && \
     perl -ni -le 'BEGIN{ $q=chr(39), $pw="password" } print; print " $q$pw$q," if /$config.*'plugins'.*=.*array/' \
     /etc/roundcubemail/config.inc.php

Add Carddav (Everyone should logout of roundcube at this point)
 # cd /usr/share/roundcubemail/plugins
 # git clone https://github.com/blind-coder/rcmcarddav carddav
 # cd carddav
 # curl -sS https://getcomposer.org/installer | php
 # php composer.phar install
 # [ "`grep \'carddav\', /etc/roundcubemail/config.inc.php`" = "" ] && \
  perl -ni -le 'BEGIN{ $q=chr(39), $cd="carddav" } print; print " $q$cd$q," if /$config.*'plugins'.*=.*array/' \
  /etc/roundcubemail/config.inc.php