config validation & webhook retry

server.js

@@ -25,7 +25,20 @@ const logger = winston.createLogger({
   ]
 });
 
+function validateConfig() {
+  const requiredKeys = ['PORT', 'SMTP_SECURE', 'WEBHOOK_URL', 'WEBHOOK_CONCURRENCY'];
+  for (const key of requiredKeys) {
+    if (!(key in config)) {
+      throw new Error(`Missing required configuration: ${key}`);
+    }
+  }
+}
+
 const webhookQueue = new Queue(async function (parsed, cb) {
+  const maxRetries = 3;
+  let retries = 0;
+
+  const attemptWebhook = async () => {
     try {
       await sendToWebhook(parsed);
       logger.info('Successfully sent to webhook');
@@ -38,8 +51,17 @@ const webhookQueue = new Queue(async function (parsed, cb) {
           data: error.response.data 
         });
       }
+      if (retries < maxRetries) {
+        retries++;
+        logger.info(`Retrying webhook (attempt ${retries}/${maxRetries})`);
+        setTimeout(attemptWebhook, 1000 * retries);
+      } else {
         cb(error);
       }
+    }
+  };
+
+  attemptWebhook();
 }, { concurrent: config.WEBHOOK_CONCURRENCY || 5 });
 
 const server = new SMTPServer({
@@ -95,3 +117,11 @@ process.on('SIGTERM', () => {
 process.on('SIGINT', () => {
   gracefulShutdown('SIGINT signal received');
 });
+
+// Add configuration validation at startup
+try {
+  validateConfig();
+} catch (error) {
+  logger.error('Configuration error:', { message: error.message });
+  process.exit(1);
+}