Hi Alex,
As you may have got the notification regarding the resolutionof NEWORKNET-33503 with Aspose.Email for .NET 2.4.0, I would like to share with you that we have included a new method RecomposeTnefContent() to save TNEF contents of a message after changing contents of its attachment(s). It’s sample usage is as follow:
MailMessage main = MailMessage.Load(“original_message.eml”);
main.Attachments[0].ContentStream = new MemoryStream(File.ReadAllBytes(“test.docx”));
main.RecomposeTnefContent();
main.From = "from@hotmail.com";
main.To = "to@aspose.com";
//send using SMTP client