Move to Docker Compose and multiple containers

postfix/Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine
+
+RUN apk add --update postfix postfix-sqlite rsyslog && rm -rf /var/cache/apk/*
+
+COPY conf /etc/postfix
+COPY rsyslog.conf /etc/rsyslog.conf
+
+COPY start.sh /start.sh
+
+CMD ["/start.sh"]

postfix/conf/main.cf

@@ -0,0 +1,38 @@
+###############
+# General
+###############
+
+# The list of relayed networks is still loaded from a configuration file
+mynetworks = 127.0.0.1/32 [::1]/128
+# Empty alias list to override the configuration variable and disable NIS
+alias_maps = hash:/etc/aliases
+# SQLite configuration
+sql = sqlite:${config_directory}/
+# Only accept virtual emails
+mydestination =
+
+###############
+# TLS
+###############
+smtpd_use_tls = yes
+smtpd_tls_cert_file=/certs/cert.pem
+smtpd_tls_key_file=/certs/key.pem
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+###############
+# SASL
+###############
+smtpd_sasl_local_domain = $myhostname
+smtpd_sasl_type = dovecot
+smtpd_sasl_path = inet:imap:2102
+smtpd_sasl_auth_enable = yes
+smtpd_sasl_security_options = noanonymous
+
+###############
+# Virtual
+###############
+virtual_mailbox_domains = ${sql}sqlite-virtual_mailbox_domains.cf
+virtual_alias_maps = ${sql}sqlite-virtual_alias_maps.cf
+virtual_transport = lmtp:inet:imap:2525
+lmtp_host_lookup = native

postfix/conf/master.cf

@@ -0,0 +1,34 @@
+# service type  private unpriv  chroot  wakeup  maxproc command + args
+#               (yes)   (yes)   (yes)   (never) (100)
+
+# Exposed SMTP services
+smtp      inet  n       -       n       -       -       smtpd
+submission inet n       -       n       -       -       smtpd
+  -o smtpd_enforce_tls=yes
+  -o smtpd_sasl_auth_enable=yes
+  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
+smtps     inet  n       -       n       -       -       smtpd
+  -o smtpd_enforce_tls=yes
+  -o smtpd_sasl_auth_enable=yes
+  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
+
+# Internal postfix services
+pickup    unix  n       -       n       60      1       pickup
+cleanup   unix  n       -       n       -       0       cleanup
+qmgr      unix  n       -       n       300     1       qmgr
+tlsmgr    unix  -       -       n       1000?   1       tlsmgr
+rewrite   unix  -       -       n       -       -       trivial-rewrite
+bounce    unix  -       -       n       -       0       bounce
+defer     unix  -       -       n       -       0       bounce
+trace     unix  -       -       n       -       0       bounce
+verify    unix  -       -       n       -       1       verify
+flush     unix  n       -       n       1000?   0       flush
+proxymap  unix  -       -       n       -       -       proxymap
+smtp      unix  -       -       n       -       -       smtp
+relay     unix  -       -       n       -       -       smtp
+error     unix  -       -       n       -       -       error
+retry     unix  -       -       n       -       -       error
+discard   unix  -       -       n       -       -       discard
+lmtp      unix  -       -       n       -       -       lmtp
+anvil     unix  -       -       n       -       1       anvil
+scache    unix  -       -       n       -       1       scache

postfix/conf/sqlite-virtual_alias_maps.cf

@@ -0,0 +1,6 @@
+dbpath = /data/freeposte.db
+query =
+ SELECT destination
+   FROM alias INNER JOIN domain ON alias.domain_id = domain.id
+  WHERE domain.name = '%d'
+    AND alias.localpart = '%u'

postfix/conf/sqlite-virtual_mailbox_domains.cf

@@ -0,0 +1,2 @@
+dbpath = /data/freeposte.db
+query = SELECT name FROM domain WHERE name='%s'

postfix/rsyslog.conf

@@ -0,0 +1,4 @@
+$ModLoad imuxsock
+$template noTimestampFormat,"%syslogtag%%msg%\n"
+$ActionFileDefaultTemplate noTimestampFormat
+*.*;auth,authpriv.none /dev/stdout

postfix/start.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+/usr/lib/postfix/master &
+rsyslogd -n