FROM ubuntu:26.04

ENV DEBIAN_FRONTEND=noninteractive

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

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

EXPOSE 25
ENTRYPOINT ["/entrypoint.sh"]