Your results are actually affected by the evaluation version limitations as mentioned in our documentation article. If you don’t use a license, the API works under evaluation mode and has the evaluation limitations as mentioned in the article. Please note that Aspose.Email is not a free API, but you can use it in full capacity by acquiring a 30-day temporary license free of cost. Please request one by following the above link and try the API with temporary license. If you still face issue, please feel free to contact us back.