FROM debian:bookworm-slim

RUN apt-get update && apt-get install -y --no-install-recommends \
    postfix \
    libsasl2-modules \
    opendkim \
    opendkim-tools \
    rsyslog \
    && rm -rf /var/lib/apt/lists/*

COPY postfix/main.cf /etc/postfix/main.cf
COPY opendkim/opendkim.conf /etc/opendkim.conf

COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

EXPOSE 25

ENTRYPOINT ["/entrypoint.sh"]