Dockerfile

ARG ALPINE_VERSION=latest
FROM alpine:${ALPINE_VERSION}
LABEL maintaner="Bojan Cekrlic - https://github.com/bokysan/docker-postfix/"

# Install supervisor, postfix
# Install postfix first to get the first account (101)
# Install opendkim second to get the second account (102)
RUN        true && \
           apk add --no-cache --upgrade cyrus-sasl cyrus-sasl-plain cyrus-sasl-login && \
           apk add --no-cache postfix && \
           apk add --no-cache opendkim && \
           apk add --no-cache --upgrade ca-certificates tzdata supervisor rsyslog musl musl-utils bash opendkim-utils && \
           (rm "/tmp/"* 2>/dev/null || true) && (rm -rf /var/cache/apk/* 2>/dev/null || true)

# Set up configuration
COPY       /configs/supervisord.conf     /etc/supervisord.conf
COPY       /configs/rsyslog*.conf        /etc/
COPY       /configs/opendkim.conf        /etc/opendkim/opendkim.conf
COPY       /configs/smtp_header_checks   /etc/postfix/smtp_header_checks
COPY       /scripts/*.sh                 /

RUN        chmod +x /run.sh /opendkim.sh

# Set up volumes
VOLUME     [ "/var/spool/postfix", "/etc/postfix", "/etc/opendkim/keys" ]

# Run supervisord
USER       root
WORKDIR    /tmp

EXPOSE     587
CMD        ["/bin/sh", "-c", "/run.sh"]