Adding the PERMIT_DOCKER option

See README.md for more informations

README.md

@@ -141,3 +141,10 @@ Otherwise, `iptables` won't be able to ban IPs.
   - self-signed => Enables self-signed certificates
 
 Please read [the SSL page in the wiki](https://github.com/tomav/docker-mailserver/wiki/Configure-SSL) for more information.
+
+##### PERMIT_DOCKER
+
+Set different options for mynetworks option (can be overwrite in postfix-main.cf)
+  - **empty** => localhost only
+  - host => Add docker host (ipv4 only)
+  - network => Add all docker containers (ipv4 only)

target/postfix/main.cf

@@ -11,7 +11,7 @@ alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 mydestination = 
 relayhost = 
-mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.17.0.0/16
+mynetworks = 127.0.0.0/8 [::1]/128 [fe80::]/64
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all

target/start-mailserver.sh

@@ -202,6 +202,25 @@ echo "Postfix configurations"
 touch /etc/postfix/vmailbox && postmap /etc/postfix/vmailbox
 touch /etc/postfix/virtual && postmap /etc/postfix/virtual
 
+# My Network Configuration
+case $PERMIT_DOCKER in
+  "host" )
+      echo "Adding host in my networks"
+      postconf -e "$(postconf -d | grep '^mynetworks =')"
+    ;;
+
+  "network" )
+      echo "Adding docker network in my networks"
+      postconf -e "$(postconf | grep '^mynetworks =') 172.0.0.0/8"
+    ;;
+
+  * )
+      echo "Adding container ip in my networks"
+      postconf -e "$(postconf | grep '^mynetworks =') $(ip addr show eth0 | grep 'inet ' | sed 's/[^0-9\.\/]*//g' | cut -d '/' -f 1)/32"
+    ;;
+
+esac
+
 #
 # Override Postfix configuration
 #