diff --git a/Dockerfile b/Dockerfile
index c66879c..a8fb3d3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM alpine
 
 RUN apk add --no-cache \
+    ca-certificates \
     nagios \
     nagios-plugins \
     nagios-plugins-dig \
@@ -14,8 +15,12 @@ RUN apk add --no-cache \
     nagios-plugins-ssh \
     nagios-plugins-ssl_validity \
     nagios-web \
-    nrpe-plugin
+    nrpe-plugin \
+    ssmtp
 
 USER nagios
 
+COPY entrypoint.sh /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
 CMD ["/usr/sbin/nagios", "/etc/nagios/nagios.cfg"]
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100755
index 0000000..f2de375
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+[ -n "${MAILER_HOST}" ] && sed -r -i "/^mailhub=/s/.*/mailhub=${MAILER_HOST}/" /etc/ssmtp/ssmtp.conf
+
+exec $@