Fix small issue for Mime parser for normal message

src/common/utils/mime_parser.cpp

@@ -33,8 +33,10 @@ bool mime_parser::parse(const std::string& str) {
 
   // find boundary
   std::size_t content_type_pos = str.find("Content-Type");  // first part
+
+  // For normal message -> don't need to parse (number of parts = 0)
   if ((content_type_pos <= 4) or (content_type_pos == std::string::npos))
-    return false;
+    return true;
 
   std::string boundary_str =
       str.substr(2, content_type_pos - 4);  // 2 for -- and 2 for CRLF