Move to Docker Compose and multiple containers

dovecot/Dockerfile

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+FROM alpine
+
+RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
+ && echo "@community http://dl-3.alpinelinux.org/alpine/edge/community/" >> /etc/apk/repositories \
+ && apk add --update \
+     dovecot \
+     dovecot-sqlite \
+     dovecot-pigeonhole-plugin@community \
+     dovecot-antispam-plugin@testing \
+ && rm -rf /var/cache/apk/*
+
+COPY conf /etc/dovecot
+COPY sieve /var/lib/dovecot
+
+COPY start.sh /start.sh
+
+CMD ["/start.sh"]

dovecot/conf/after.sieve

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+require ["fileinto", "envelope", "mailbox"];
+
+if header :contains "X-Spam-Flag" "YES" {
+  fileinto :create "Junk";
+}

dovecot/conf/dovecot-sql.conf.ext

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+driver = sqlite
+connect = /data/freeposte.db
+
+# Return the user hashed password
+password_query = \
+ SELECT password \
+   FROM user INNER JOIN domain ON user.domain_id = domain.id \
+  WHERE domain.name = '%d' \
+    AND user.username = '%n'
+
+# Mostly get the user quota
+user_query = \
+ SELECT '*:bytes=' || user.quota_bytes AS quota_rule \
+   FROM user INNER JOIN domain ON user.domain_id = domain.id \
+  WHERE domain.name = '%d' \
+    AND user.username = '%n'

dovecot/conf/dovecot.conf

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+###############
+# General
+###############
+log_path = /dev/stderr
+protocols = imap lmtp sieve
+postmaster_address = %{env:POSTMASTER_ADDRESS}
+hostname = %{env:MAIL_HOSTNAME}
+mail_plugins = $mail_plugins quota
+
+service dict {
+  unix_listener dict {
+    group = mail
+    mode = 0660
+  }
+}
+
+###############
+# Mailboxes
+###############
+first_valid_gid = 8
+first_valid_uid = 8
+mail_location = maildir:/mail/%u
+mail_home = /mail/%u
+mail_uid = mail
+mail_gid = mail
+mail_privileged_group = mail
+mail_access_groups = mail
+
+namespace inbox {
+  inbox = yes
+  mailbox Trash {
+    auto = subscribe
+    special_use = \Trash
+  }
+  mailbox Drafts {
+    auto = subscribe
+    special_use = \Drafts
+  }
+  mailbox Sent {
+    auto = subscribe
+    special_use = \Sent
+  }
+  mailbox Junk {
+    auto = subscribe
+    special_use = \Junk
+  }
+}
+
+###############
+# TLS
+###############
+ssl = yes
+ssl_cert = </certs/cert.pem
+ssl_key = </certs/key.pem
+
+###############
+# Authentication
+###############
+auth_mechanisms = plain login
+
+passdb {
+  driver = sql
+  args = /etc/dovecot/dovecot-sql.conf.ext
+}
+
+userdb {
+  driver = sql
+  args = /etc/dovecot/dovecot-sql.conf.ext
+}
+
+service auth {
+  user = dovecot
+  unix_listener auth-userdb {
+  }
+
+  inet_listener {
+    port = 2102
+  }
+}
+
+service auth-worker {
+  unix_listener auth-worker {
+    user = mail
+    group = $default_internal_user
+    mode = 0660
+  }
+  user = mail
+}
+
+###############
+# IMAP
+###############
+
+protocol imap {
+  mail_plugins = $mail_plugins imap_quota
+}
+
+service imap-login {
+  inet_listener imap {
+    port = 143
+  }
+  inet_listener imaps {
+    port = 993
+  }
+}
+
+###############
+# Delivery
+###############
+
+protocol lmtp {
+  mail_plugins = $mail_plugins sieve
+  recipient_delimiter = +
+}
+
+service lmtp {
+  inet_listener lmtp {
+    port = 2525
+  }
+}
+
+plugin {
+  quota = maildir:User quota
+}
+
+
+###############
+# Filtering
+###############
+
+service managesieve-login {
+	inet_listener sieve {
+    port = 4190
+  }
+}
+
+plugin {
+	sieve = ~/.sieve
+	sieve_dir = ~/sieve
+	sieve_before = /var/lib/dovecot/before.sieve
+	sieve_default = /var/lib/dovecot/default.sieve
+	sieve_after = /var/lib/dovecot/after.sieve
+}

dovecot/start.sh

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+#!/bin/sh
+
+# Fix permissions
+chown -R mail:mail /mail
+chown -R mail:mail /var/lib/dovecot
+
+# Run dovecot
+exec /usr/sbin/dovecot -c /etc/dovecot/dovecot.conf -F