Thank you for contacting Aspose support team.
I have checked the MhtSaveOptions in detail but no such option is available which can produce similar output. As PDF is created by Aspose.Words API based on Mhtml created by Aspose.Email, therefore it is not possible to generate such output using Aspose.Email.
You may please contact Aspose.Words or Aspose.Pdf to generate such PDF file. Should you have any other query related to Aspose.Email, please feel free to write us back.