diff --git a/Dockerfile b/Dockerfile
index fca87ab..94ab1e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -58,6 +58,8 @@ RUN chown -R root:root /etc/postfix
 RUN newaliases
 RUN mkdir -m 1777 /var/log/procmail
 ADD ./etc/logrotate.procmail /etc/logrotate.d/procmail
+RUN cp /etc/resolv.conf /var/spool/postfix/etc/
+RUN cp /etc/services /var/spool/postfix/etc/
 
 # Build RT and extensions
 ADD ./scripts/installext.sh /src/installext.sh
diff --git a/README b/README
index 640fa8a..dda1886 100644
--- a/README
+++ b/README
@@ -30,7 +30,7 @@ Run a one-off container to configure the database:
   docker run \
     --link rtdb:db \
     -e DATABASE_USER=rt_user \
-    -e DATABASE_PASS=rt_pass \
+    -e DATABASE_PASSWORD=rt_pass \
     -e DATABASE_NAME=rt4 \
     nickstenning/rt \
     /usr/bin/rtinit
@@ -42,7 +42,7 @@ Now the database is initialised and you can run RT proper:
     -p 25 \
     -p 80 \
     -e DATABASE_USER=rt_user \
-    -e DATABASE_PASS=rt_pass \
+    -e DATABASE_PASSWORD=rt_pass \
     -e DATABASE_NAME=rt4 \
     nickstenning/rt
 
@@ -58,7 +58,7 @@ You can provide the DATABASE_HOST directly:
     -p 80 \
     -e DATABASE_HOST=dbserver \
     -e DATABASE_USER=rt_user \
-    -e DATABASE_PASS=rt_pass \
+    -e DATABASE_PASSWORD=rt_pass \
     -e DATABASE_NAME=rt4 \
     nickstenning/rt
 
@@ -66,4 +66,10 @@ configuration
 -------------
 
 This image provides some limited support for customising the deployment using
-environment variables. See RT_SiteConfig.pm for details.
+environment variables.  See RT_SiteConfig.pm for the various variables which,
+can be defined to configure how the container starts up
+
+By default the postfix within the container will be set to relay (relay_host),
+ail to containers gateway IP address, to redefine `relay_host` use:
+
+  -e RELAY_IP='some.ip.goes.here'
diff --git a/etc/postfix/main.cf b/etc/postfix/main.cf
index 124640a..fdd1a96 100644
--- a/etc/postfix/main.cf
+++ b/etc/postfix/main.cf
@@ -1,10 +1,32 @@
-myhostname = rt.example.org
-mydomain = example.org
-myorigin = $myhostname
+mail_owner = postfix
+myhostname = WEB_DOMAIN
+mydomain = WEB_DOMAIN
+myorigin = WEB_DOMAIN
 inet_interfaces = all
 mydestination = $myhostname
 unknown_local_recipient_reject_code = 550
-relayhost = mailrelay.example.org
+relayhost = RELAY_IP
+relay_domains =
+        WEB_DOMAIN
 alias_maps = hash:/etc/postfix/aliases
 alias_database = hash:/etc/postfix/aliases
-recipient_delimiter = -
+mailman_destination_recipient_limit=1
+smtpd_helo_restrictions =
+        reject_non_fqdn_hostname,
+        reject_invalid_hostname,
+        permit
+smtpd_sender_restrictions =
+        permit_mynetworks,
+        reject_non_fqdn_sender,
+        reject_unknown_sender_domain,
+        permit
+smtpd_recipient_restrictions =
+        permit_mynetworks,
+        reject_unauth_pipelining,
+        reject_non_fqdn_recipient,
+        reject_unknown_recipient_domain,
+        reject_invalid_hostname,
+        reject_unauth_destination,
+        reject_rbl_client sbl-xbl.spamhaus.org,
+        permit
+
diff --git a/etc/postfix/procmailrc.rt b/etc/postfix/procmailrc.rt
index 261df61..5e971ac 100644
--- a/etc/postfix/procmailrc.rt
+++ b/etc/postfix/procmailrc.rt
@@ -4,7 +4,7 @@ LOGFILE=/var/log/procmail/rt.log
 #Messages >300000 characters proceed to recipient (unlikely to be spam)
 :0w
 * > 300000
-| rt-mailgate --queue $QUEUE --action $ACTION --url http://rt.example.org/
+| rt-mailgate --queue $QUEUE --action $ACTION --url http://WEB_DOMAIN/
 
 :0w
 * ^X-RT-Loop-Prevention: example.org
@@ -18,8 +18,8 @@ LOGFILE=/var/log/procmail/rt.log
 #if the spam trigger is fired send to spam queue
 :0w
 * ^X-spam-Status: Yes
-| rt-mailgate --queue spam --action correspond --url http://rt.example.org/
+| rt-mailgate --queue spam --action correspond --url http://WEB_DOMAIN/
 
 #if the spam trigger is not fired then send to expected destination
 :0w
-| rt-mailgate --queue $QUEUE --action $ACTION --url http://rt.example.org/
+| rt-mailgate --queue $QUEUE --action $ACTION --url http://WEB_DOMAIN/
diff --git a/svc/postfix/run b/svc/postfix/run
index 136893b..4018a90 100755
--- a/svc/postfix/run
+++ b/svc/postfix/run
@@ -1,11 +1,17 @@
 #!/bin/sh
 exec 2>&1
 
-command_directory=$(postconf -h command_directory)
-daemon_directory=$("$command_directory"/postconf -h daemon_directory)
 
-# make consistency check
-"$command_directory"/postfix check
+#these are expected to be passed in via docker -e
+if [ -z ${RELAY_IP} ];
+then
+    RELAY_IP=$(route -n | awk /UG/'{print $2}' | head -1)
+fi
 
-# run Postfix
-exec "$daemon_directory"/master
+sed -e "s/RELAY_IP/${RELAY_IP}/g" -i /etc/postfix/main.cf
+sed -e "s/WEB_DOMAIN/${WEB_DOMAIN}/g" -i /etc/postfix/main.cf
+sed -e "s/WEB_DOMAIN/${WEB_DOMAIN}/g" -i /etc/postfix/procmailrc.rt
+
+service postfix start
+sleep 5
+exec tail -F /var/log/mail.log