Specify an Internet Encoding Scheme for the Body and Attachments of a Message

This topic shows how to use the MAPI property, PidTagInternetMailOverrideFormat, and the Microsoft Outlook object model to specify an Internet encoding scheme for the Exchange Internet Mail Service (IMS) to encode the body and attachments of a mail item.

The following code sample in Visual C# shows how to reference PidTagInternetMailOverrideFormat with its MAPI proptag namespace and use the PropertyAccessor object of the Outlook object model to specify MIME as the Internet encoding scheme for a message. PidTagInternetMailOverrideFormat is referenced as:

https://schemas.microsoft.com/mapi/proptag/0x59020003

where 0x59020003 is the proptag of PidTagInternetMailOverrideFormat.

private void SendMail_Click() 
{ 
    Outlook.NameSpace objSession; 
    Outlook.MailItem objMailItem; 
    Outlook.Recipient objRecipient; 
    Outlook.PropertyAccessor oPA; 
 
    string Recipient, MsgSubject, ImageFile, TextFile, FileLocation, PropName; 
    int EncodingFlag; 
     
 
    //Modify the following to appropriate values. 
    Recipient = "someone@example.com"; 
    EncodingFlag = 1; //Use MIME encoding 
    MsgSubject = "Test Encoding"; 
    ImageFile = "garden.jpg"; 
    TextFile = "mytext.txt"; 
    FileLocation = "c:\\"; 
 
    objSession = Application.GetNamespace("MAPI"); 
    objSession.Logon(null, null, true, null); 
 
    objMailItem = Application.CreateItem( 
                Outlook.OlItemType.olMailItem) as Outlook.MailItem; 
    objMailItem.Subject = MsgSubject; 
    objMailItem.Body = "body"; 
    objMailItem.Attachments.Add(FileLocation + TextFile, 
        Outlook.OlAttachmentType.olByValue, 1, TextFile); 
    objMailItem.Attachments.Add(FileLocation + ImageFile, 
        Outlook.OlAttachmentType.olByValue, 1, ImageFile); 
 
    objRecipient = objMailItem.Recipients.Add(Recipient); 
    objRecipient.Resolve(); 
 
    PropName = "https://schemas.microsoft.com/mapi/proptag/0x59020003"; 
    oPA = objMailItem.PropertyAccessor; 
    oPA.SetProperty(PropName, EncodingFlag); 
 
    objMailItem.Send(); 
 
    objSession.Logoff(); 
 
}

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