diff --git a/.env.sample b/.env.sample
index 3219a3f..fd54e8f 100644
--- a/.env.sample
+++ b/.env.sample
@@ -11,6 +11,8 @@ LETS_ENCRYPT_ENV=production
 #DISCOURSE_SMTP_USER=
 #DISCOURSE_SMTP_PROTOCOL=
 #DISCOURSE_SMTP_AUTH=
+# Set this if you send e-mails from a different domain than noreply@$DOMAIN
+#DISCOURSE_NOTIFICATION_EMAIL=$SMTP_USER
 
 # SMTP authentication
 #COMPOSE_FILE="compose.yml:compose.smtpauth.yml"
diff --git a/compose.yml b/compose.yml
index 172c6a4..8de5ad1 100644
--- a/compose.yml
+++ b/compose.yml
@@ -20,6 +20,7 @@ services:
       - DISCOURSE_SMTP_USER
       - DISCOURSE_SMTP_PROTOCOL
       - DISCOURSE_SMTP_AUTH
+      - DISCOURSE_NOTIFICATION_EMAIL
     volumes:
       - 'discourse_data:/bitnami/discourse'
     secrets: