FROM almalinux:8 RUN useradd -m -s /bin/false vmail RUN dnf install -y epel-release && dnf update -y \ && dnf clean all \ && rm -rf /var/cache/yum RUN dnf install -y postfix-3.5.8 postfix-ldap-3.5.8 postfix-mysql-3.5.8 postfix-pgsql-3.5.8 \ dovecot-2.3.16 dovecot-pigeonhole-2.3.16 opendkim-2.11.0 opendmarc-1.4.1.1 \ cyrus-sasl cyrus-sasl-plain cyrus-sasl-md5 pypolicyd-spf \ && dnf clean all \ && rm -rf /var/cache/yum EXPOSE 110 143 993 995 CMD ["/usr/sbin/dovecot", "-F"]