Try this fix

src/haraka-plugins/queue/store_message.js

@@ -7,23 +7,15 @@ exports.register = function () {
     if (!transaction) return next();
 
     try {
-      // Get the full message body
+      // Get the raw email content
-      let body = '';
+      const body = await new Promise((resolve, reject) => {
-      
+        let messageContent = '';
-      if (transaction.message_stream) {
+        transaction.message_stream.on('data', chunk => {
-        // Convert Buffer to string and handle JSON stringification properly
+          messageContent += chunk.toString();
-        if (Buffer.isBuffer(transaction.message_stream)) {
+        });
-          body = transaction.message_stream.toString('utf8');
+        transaction.message_stream.on('end', () => resolve(messageContent));
-        } else if (typeof transaction.message_stream === 'object') {
+        transaction.message_stream.on('error', reject);
-          body = JSON.stringify(transaction.message_stream);
+      });
-        } else {
-          body = String(transaction.message_stream);
-        }
-      }
-
-      // Debug logging
-      connection.logdebug(plugin, 'Message Stream Type:', typeof transaction.message_stream);
-      connection.logdebug(plugin, 'Message Stream:', transaction.message_stream);
 
       const messageData = {
         from: transaction.mail_from.address(),
@@ -33,11 +25,6 @@ exports.register = function () {
         headers: transaction.header ? transaction.header.headers_decoded : {},
       };
 
-      // Debug logging
-      connection.logdebug(plugin, 'Message Data:');
-      connection.logdebug(plugin, `Body type: ${typeof body}`);
-      connection.logdebug(plugin, `Body content: ${body.substring(0, 100)}...`); // First 100 chars
-
       await MessageService.store(messageData);
       next();
     } catch (error) {