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base/opensmtpd/6.6.1p1/Dockerfile

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+FROM ubuntu:focal
+
+LABEL maintainer="ph1sh && phithon <root@leavesongs.com>"
+
+RUN set -ex \
+    && apt-get update \
+    && apt-get install --no-install-recommends -y ca-certificates wget bison autoconf automake gcc make libc-dev libasr-dev libssl-dev libevent-dev zlib1g-dev \
+    && cd /usr/src \
+    && wget -qO- https://www.opensmtpd.org/archives/opensmtpd-6.6.1p1.tar.gz | tar xz --strip-components=1 \
+    && ./configure \
+    && make \
+    && make install \
+    && cd / \
+    && apt-get purge -y --auto-remove bison autoconf automake gcc make \
+    && rm -rf /var/lib/apt/lists/* /usr/src/*
+
+RUN set -ex \
+    && mkdir /var/empty \
+    && useradd -c "SMTP Daemon" -d /var/empty -s /sbin/nologin _smtpd \
+    && useradd -c "SMTPD Queue" -d /var/empty -s /sbin/nologin _smtpq
+
+COPY aliases /etc/
+COPY smtpd.conf /usr/local/etc/
+
+WORKDIR /tmp
+EXPOSE 25
+CMD ["smtpd", "-dv"]