Add postfix

postfix/Dockerfile

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+FROM alpine:3.20
+ENV DOCKERIZE_VERSION v0.7.0
+
+# install packages
+RUN apk add --no-cache --update postfix bash && \
+    apk add --no-cache --upgrade musl musl-utils && \
+    (rm "/tmp/"* 2>/dev/null || true) && (rm -rf /var/cache/apk/* 2>/dev/null || true)
+
+# install dockerize
+RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
+    && tar -C /usr/local/bin -xzvf dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
+    && rm dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz
+
+# copy postfix config file template into image
+COPY main.cf.tmpl /etc/postfix/main.cf.tmpl
+
+# copy entrypoint script into an image
+COPY docker-entrypoint.sh /
+
+# postfix is listening on port 25
+EXPOSE 25
+STOPSIGNAL SIGKILL
+
+CMD /docker-entrypoint.sh
+

postfix/README.md

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+# postfix
+
+Started with guide at https://www.iops.tech/blog/postfix-in-alpine-docker-container/
+
+```
+Rebuild count: 0
+```

postfix/docker-entrypoint.sh

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+#/usr/bin/env bash
+
+set -eou pipefail
+
+dockerize -template /etc/postfix/main.cf.tmpl:/etc/postfix/main.cf postfix start-fg
+

postfix/main.cf.tmpl

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+maillog_file = /dev/stdout
+smtp_helo_name = {{ .Env.POSTFIX_SMTP_HELO_NAME }}
+myorigin = {{ .Env.POSTFIX_MYORIGIN }}
+
+smtpd_banner = $myhostname ESMTP
+biff = no
+append_dot_mydomain = no
+readme_directory = no
+
+compatibility_level = 2
+
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
+myhostname = {{ .Env.POSTFIX_MYHOSTNAME }}
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+mydestination = localhost.localdomain, localhost
+relayhost =
+mynetworks = 127.0.0.0/8 192.168.0.0/16 172.16.0.0/12
+mailbox_size_limit = 0
+recipient_delimiter = +
+inet_interfaces = all
+inet_protocols = ipv4
+