Ability to disable SNS bounce handling

.env.example

@@ -19,4 +19,16 @@ MYSQL_PASSWORD=change_this_password
 MYSQL_ROOT_PASSWORD=change_this_root_password
 
 # API Configuration
-API_TOKEN=change_this_to_a_secure_random_token
+API_TOKEN=change_this_to_a_secure_random_token
+
+# Bounce Handling Configuration (Optional)
+# Set to 'true' to enable SNS webhook bounce handling
+# Set to 'false' to disable and rely on email-based bounce handling
+ENABLE_SNS_WEBHOOKS=false
+ENABLE_BOUNCE_HANDLING=false
+
+# If ENABLE_SNS_WEBHOOKS=true, you need:
+# 1. AWS SNS topic configured
+# 2. SES configured to send notifications to SNS topic  
+# 3. Valid HTTPS domain for webhook endpoint
+# 4. SNS subscription confirmed to your webhook endpoint