FROM debian:12-slim

ENV DEBIAN_FRONTEND=noninteractive \
    POSTFIX_OPTS=""

COPY start.sh /start.sh
RUN apt-get update \
    && apt-get dist-upgrade -y \
    && apt-get install -y --no-install-recommends \
        postfix \
        swaks \
        prometheus-postfix-exporter \
    && rm -rf /var/lib/apt/lists/* \
    && chmod +x /start.sh

EXPOSE 25
EXPOSE 587

CMD ["sh", "/start.sh"]