First version

Dockerfile

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+FROM debian:buster-slim
+LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
+
+EXPOSE 25/tcp
+EXPOSE 143/tcp
+ENV DEB_URL https://protonmail.com/download/protonmail-bridge_1.2.6-1_amd64.deb
+WORKDIR /root
+
+# Copy gpg parameters and .deb installer
+COPY gpgparams /protonmail/
+
+# Install dependencies and protonmail bridge
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends socat pass \
+    && apt-get install -y wget \
+    && wget -O /protonmail/protonmail.deb ${DEB_URL} \
+    && apt-get install -y --no-install-recommends /protonmail/protonmail.deb \
+    && apt-get purge -y wget \
+    && apt-get autoremove -y \
+    && rm -rf /var/lib/apt/lists/* \
+    && rm /protonmail/protonmail.deb
+
+COPY entrypoint.sh /bin/
+RUN chmod +x /bin/entrypoint.sh
+
+ENTRYPOINT ["/bin/entrypoint.sh"]