mynetworks env variable, some cleanup

Dockerfile

@@ -4,12 +4,12 @@ MAINTAINER Elliott Ye
 # Set noninteractive mode for apt-get
 ENV DEBIAN_FRONTEND noninteractive
 
-# Update
-RUN apt-get update
-
-# Start editing
-# Install package here for cache
-RUN apt-get -y install supervisor postfix sasl2-bin opendkim opendkim-tools
+RUN apt-get update && apt-get install -y \
+    opendkim \
+    opendkim-tools \
+    postfix \
+    supervisor \
+    sasl2-bin
 
 # Add files
 ADD assets/install.sh /opt/install.sh

README.md

@@ -40,6 +40,17 @@ TLS and OpenDKIM support are optional.
 			--name postfix -d catatnight/postfix
 	```
 
+4. (Optional) Configure postfix to allow relaying from a local docker network (containers in the same network):
+```
+network=`docker network inspect --format='{{range .IPAM.Config}}{{.Subnet}}{{end}}' my_docker_network`
+
+docker run -d --name smtp \
+  --net=my_docker_network \
+  -e maildomain=mydomain.localhost \
+  -e mynetworks=127.0.0.0/8,$network \
+  myrepo/postfix
+```
+
 ## Note
 + Login credential should be set to (`[email protected]`, `password`) in Smtp Client
 + You can assign the port of MTA on the host machine to one other than 25 ([postfix how-to](http://www.postfix.org/MULTI_INSTANCE_README.html))

assets/install.sh

@@ -5,6 +5,12 @@ if [[ -a /etc/supervisor/conf.d/supervisord.conf ]]; then
   exit 0
 fi
 
+if [ -z "$maildomain" ]; then
+  echo '$maildomain env variable not set, exiting'
+  exit 1
+fi
+echo "*** maildomain = $maildomain"
+
 #supervisor
 cat > /etc/supervisor/conf.d/supervisord.conf <<EOF
 [supervisord]
@@ -29,6 +35,11 @@ chmod +x /opt/postfix.sh
 postconf -e myhostname=$maildomain
 postconf -F '*/*/chroot = n'
 
+if [ -n "$mynetworks" ]; then
+  echo "*** configuring mynetworks = $mynetworks"
+  postconf -e mynetworks=$mynetworks
+fi
+
 ############
 # SASL SUPPORT FOR CLIENTS
 # The following options set parameters needed by Postfix to enable
@@ -37,7 +48,7 @@ postconf -F '*/*/chroot = n'
 # /etc/postfix/main.cf
 postconf -e smtpd_sasl_auth_enable=yes
 postconf -e broken_sasl_auth_clients=yes
-postconf -e smtpd_recipient_restrictions=permit_sasl_authenticated,reject_unauth_destination
+postconf -e smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination
 # smtpd.conf
 cat >> /etc/postfix/sasl/smtpd.conf <<EOF
 pwcheck_method: auxprop
@@ -65,7 +76,7 @@ if [[ -n "$(find /etc/postfix/certs -iname *.crt)" && -n "$(find /etc/postfix/ce
   postconf -P "submission/inet/smtpd_tls_security_level=encrypt"
   postconf -P "submission/inet/smtpd_sasl_auth_enable=yes"
   postconf -P "submission/inet/milter_macro_daemon_name=ORIGINATING"
-  postconf -P "submission/inet/smtpd_recipient_restrictions=permit_sasl_authenticated,reject_unauth_destination"
+  postconf -P "submission/inet/smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination"
 fi
 
 #############
@@ -127,4 +138,5 @@ cat >> /etc/opendkim/SigningTable <<EOF
 *@$maildomain mail._domainkey.$maildomain
 EOF
 chown opendkim:opendkim $(find /etc/opendkim/domainkeys -iname *.private)
-chmod 400 $(find /etc/opendkim/domainkeys -iname *.private)
+chmod 400 $(find /etc/opendkim/domainkeys -iname *.private)
+