FROM debian:buster-slim ENV \ DEBIAN_FRONTEND=noninteractive \ DOMAINNAME=example.com \ MAILNAME=mail \ POSTMASTER=postmaster@example.com \ SSL_CERT=/etc/ssl/mailserver.crt \ SSL_KEY=/etc/ssl/mailserver.key RUN \ apt-get update \ && apt-get upgrade -y \ && apt-get install -y --no-install-recommends \ postfix \ telnet \ dovecot-core \ dovecot-pop3d \ dovecot-imapd \ dovecot-lmtpd \ supervisor \ rsyslog \ opendkim \ opendkim-tools \ && apt-get autoclean \ && apt-get autoremove RUN \ rm /etc/postfix/main.cf /etc/postfix/master.cf /etc/dovecot/dovecot.conf /etc/dovecot/conf.d/* /etc/rsyslog.conf /etc/rsyslog.d/* \ && groupadd -g 5000 vmail \ && useradd -d /var/mail -M -s /usr/sbin/nologin -u 5000 -g 5000 vmail \ && usermod -aG vmail postfix \ && usermod -aG vmail dovecot \ && usermod -aG vmail opendkim\ && mkdir -p -m 751 /var/mail/ \ && mkdir -p -m 755 /etc/mail/ \ && mkdir -p -m 755 /etc/ssl/ \ && mkdir -p -m 700 /etc/opendkim/keys \ && chown vmail:vmail /var/mail \ && chown opendkim:opendkim /etc/opendkim/keys # Copy config files COPY rootfs/ / EXPOSE 25 143 587 993 ENTRYPOINT /usr/bin/start.sh