diff --git a/README.md b/README.md
index c1ff4df..6378993 100644
--- a/README.md
+++ b/README.md
@@ -211,6 +211,10 @@ These are the variables that you MUST change in your docker-compose.yaml before
 - `DATABASE_CLASS`: Default value is
   `mailman.database.sqlite.SQLiteDatabase`. The values for this can be found in
   the mailman's documentation [here][11].
+- `SMTP_HOST`	: outgoing host for SMTP connections
+- `SMTP_PORT`	: use this port. 25, 587, whatever your host asks for.
+- `SMTP_HOST_USER`: authenticate this user
+- `SMTP_HOST_PASSWORD`: and use this password
 
 For more details on how to configure this image, please look [Mailman-core's
 Readme](core/)
diff --git a/core/docker-entrypoint.sh b/core/docker-entrypoint.sh
index 80aa6c7..21f700c 100755
--- a/core/docker-entrypoint.sh
+++ b/core/docker-entrypoint.sh
@@ -142,6 +142,8 @@ lmtp_host: $MM_HOSTNAME
 lmtp_port: 8024
 smtp_host: $SMTP_HOST
 smtp_port: $SMTP_PORT
+smtp_user: $SMTP_HOST_USER
+smtp_pass: $SMTP_HOST_PASSWORD
 configuration: python:mailman.config.exim4
 
 EOF
@@ -163,6 +165,8 @@ lmtp_host: $MM_HOSTNAME
 lmtp_port: 8024
 smtp_host: $SMTP_HOST
 smtp_port: $SMTP_PORT
+smtp_user: $SMTP_HOST_USER
+smtp_pass: $SMTP_HOST_PASSWORD
 configuration: /etc/postfix-mailman.cfg
 
 EOF