Simple yet functional dovecot+postfix

Dockerfile

@@ -3,12 +3,18 @@ FROM debian:jessie
 RUN export DEBIAN_FRONTEND=noninteractive \
  && apt-get update \
  && apt-get install -y --no-install-recommends \
-      postfix dovecot-imapd dovecot-sqlite \
+      postfix dovecot-imapd dovecot-sqlite dovecot-lmtpd \
       dovecot-sieve dovecot-managesieved \
       dovecot-antispam spamassassin clamav \
-      supervisor \
+      supervisor rsyslog \
  && apt-get clean
 
+# When installed non-interactively, the file does not get copied to the
+# postfix chroot, thus causing smtpd to fail.
+RUN cp /etc/services /var/spool/postfix/etc/
+
 ADD config /etc/
 
+# Explicitely specify the configuration file to avoid problems when
+# the default configuration path changes.
 CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/supervisord.conf"]