diff --git a/docker-compose.yml b/docker-compose.yml
index 02c43b5..fe16df4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -97,14 +97,37 @@
 #	The inital database to be created on first launch of influxdb. Ignored
 #	after influxdb has been launched.
 #
-# TTN_DASHBOARD_MAIL_DOMAIN
-# the postfix mail domain.
-#
 # TTN_DASHBOARD_MAIL_HOST_NAME
-# the external FQDN for the mail host.
+# 	The mail hostname.
+#
+# TTN_MAIL_RELAY_NETWORKS
+#	The relay networks. MUST start with ":"
+#	e.g :192.168.0.0/24 or :192.168.0.0/24:10.0.0.0/16.
+#
+# TTN_SMARTHOST_ADDRESS
+#	The smarthost address.
+#
+# TTN_SMARTHOST_PORT
+#	The smarthost port.
+#
+# TTN_SMARTHOST_USER
+#	The smarthost username.
+#
+# TTN_SMARTHOST_PASSWORD
+#	The smarthost user password.
+#
+# TTN_GMAIL_USER
+#	[SMTP relay] The Google Mail username.
 #
-# TTN_DASHBOARD_MAIL_RELAY_IP
-# the mail relay machine, assuming that the real mailer is upstream from us.
+# TTN_GMAIL_PASSWORD
+#	[SMTP relay] The Google Mail user password.
+#
+# TTN_SMARTHOST_PASSWORD
+#	The smarthost user password.
+#
+# TTN_SMARTHOST_ALIASES
+#	 A list of aliases to puth auth data for authentication, semicolon separated.
+# 	 e.g. TTN_SMARTHOST_ALIASES=*.mysmtp.com
 #
 # TTN_DASHBOARD_PORT_HTTP
 #	The port to listen to for HTTP. Primarily for test purposes. Defaults to
@@ -157,10 +180,10 @@ services:
     user: "root"
     volumes:
       - "${TTN_DASHBOARD_DATA}node-red:/data"
-    # nodered opens ports on influxdb so it needs to be able to talk to it.
+    # nodered opens ports on influxdb and smtp so it needs to be able to talk to them.
     links:
       - influxdb
-      - postfix
+      - smtp
     environment:
       TZ: "${TTN_DASHBOARD_TIMEZONE:-GMT}"
 
@@ -191,17 +214,21 @@ services:
     links:
       - influxdb
 
-
-  postfix:
+  smtp:
     restart: unless-stopped
-    build:
-      context: ./postfix
-      dockerfile: Dockerfile
-      args:
-        relay_ip: "${TTN_DASHBOARD_MAIL_RELAY_IP:-}"
-        host_name: "${TTN_DASHBOARD_MAIL_HOST_NAME:-.}"
-        domain: "${TTN_DASHBOARD_MAIL_DOMAIN:-.}"
-
+    # Documentation: https://hub.docker.com/r/namshi/smtp
+    image: namshi/smtp
+    environment:
+      TZ: "${TTN_DASHBOARD_TIMEZONE:-GMT}"
+      MAILNAME: "${TTN_DASHBOARD_MAIL_HOST_NAME:-.}"
+      RELAY_NETWORKS: "${TTN_MAIL_RELAY_NETWORKS}"
+      SMARTHOST_ADDRESS: "${TTN_SMARTHOST_ADDRESS}"
+      SMARTHOST_PORT: "${TTN_SMARTHOST_PORT}"
+      SMARTHOST_USER: "${TTN_SMARTHOST_USER}"
+      SMARTHOST_PASSWORD: "${TTN_SMARTHOST_PASSWORD}"
+      SMARTHOST_ALIASES: "${TTN_SMARTHOST_ALIASES}"
+      GMAIL_USER: "${TTN_GMAIL_USER}"
+      GMAIL_PASSWORD: "${TTN_GMAIL_PASSWORD}"
 
   grafana:
     restart: unless-stopped
@@ -215,16 +242,16 @@ services:
       GF_SERVER_ROOT_URL: "https://%(domain)s/grafana/"
       GF_SMTP_ENABLED: "${TTN_DASHBOARD_GRAFANA_SMTP_ENABLED:-false}"
       GF_SMTP_SKIP_VERIFY: "${TTN_DASHBOARD_GRAFANA_SMTP_SKIP_VERIFY:-false}"
-      GF_SMTP_HOST: "postfix:25"
+      GF_SMTP_HOST: "smtp:25"
       GF_SMTP_FROM_ADDRESS: "${TTN_DASHBOARD_GRAFANA_SMTP_FROM_ADDRESS:-grafana@localhost}"
       GF_SMTP_FROM_NAME: "${TTN_DASHBOARD_GRAFANA_PROJECT_NAME:-Default} grafana admin"
       GF_LOG_MODE: "${TTN_DASHBOARD_GRAFANA_LOG_MODE:-console,file}"
       GF_LOG_LEVEL: "${TTN_DASHBOARD_GRAFANA_LOG_LEVEL:-info}"
       GF_INSTALL_PLUGINS: "${TTN_DASHBOARD_GRAFANA_INSTALL_PLUGINS:-}"
       GF_USERS_ALLOW_SIGN_UP: "${TTN_DASHBOARD_GRAFANA_USERS_ALLOW_SIGN_UP:-false}"
-    # grafana opens ports on influxdb and postfix, so it needs to be able to talk to it.
+    # grafana opens ports on influxdb and smtp, so it needs to be able to talk to them.
     links:
       - influxdb
-      - postfix
+      - smtp
 
 ### end of file ###
diff --git a/postfix/Dockerfile b/postfix/Dockerfile
deleted file mode 100644
index e093ed3..0000000
--- a/postfix/Dockerfile
+++ /dev/null
@@ -1,38 +0,0 @@
-#
-# Dockerfile for building POSTFIX
-#
-# Build the Postfix  using phusion base image
-FROM phusion/baseimage
-
-# some basic package installation for troubleshooting
-RUN apt-get update && apt-get install -y \
-    iputils-ping \
-    net-tools \
-    debconf-utils \
-    mailutils
-
-# passing arguments to build postfix image
-ARG relay_ip
-ARG host_name
-ARG domain
-
-# Install Postfix
-RUN echo "postfix postfix/mailname string $host_name" | debconf-set-selections
-RUN echo "postfix postfix/main_mailer_type string 'Internet Site'" | debconf-set-selections
-RUN apt-get install -y postfix
-RUN postconf -e relayhost=$relay_ip
-RUN postconf -e myhostname=$host_name
-RUN postconf -e mydomain=$domain
-RUN postconf -e smtp_generic_maps=hash:/etc/postfix/generic
-RUN postconf -e mynetworks="127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.18.0.0/16"
-RUN postconf -e smtpd_use_tls=no
-RUN echo $host_name > /etc/mailname
-
-# This will replace local mail addresses by valid Internet addresses when mail leaves the machine via SMTP. so please change it according to container.
-RUN echo "root@aa7fde2ee7f1 iotmail@example.com" > /etc/postfix/generic
-RUN postmap /etc/postfix/generic
-
-# Start the postfix daemon during container startup
-RUN mkdir -p /etc/my_init.d
-COPY postfix.sh /etc/my_init.d/postfix.sh
-RUN chmod +x /etc/my_init.d/postfix.sh
diff --git a/postfix/postfix.sh b/postfix/postfix.sh
deleted file mode 100644
index c14d96e..0000000
--- a/postfix/postfix.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-/etc/init.d/postfix restart