_create_forward_message fixed for multipart messages

email-worker/email_processing/rules_processor.py

@@ -272,13 +272,22 @@ class RulesProcessor:
 
             msg.attach(body_part)
 
-        # Copy attachments
+            # Copy attachments - FIX FILENAMES
             if original_parsed.is_multipart():
                 for part in original_parsed.walk():
                     if part.get_content_maintype() == 'multipart':
                         continue
                     if part.get_content_type() in ['text/plain', 'text/html']:
                         continue
+                    
+                    # Fix malformed filename in Content-Disposition
+                    content_disp = part.get('Content-Disposition', '')
+                    if 'filename=' in content_disp and '"' not in content_disp:
+                        # Add quotes around filename with spaces
+                        import re
+                        fixed_disp = re.sub(r'filename=([^;"\s]+(?:\s+[^;"\s]+)*)', r'filename="\1"', content_disp)
+                        part.replace_header('Content-Disposition', fixed_disp)
+                    
                     msg.attach(part)
 
             return msg