On 4 , 00:09, "Mark Beiley" nowhere AT donotuse.com wrote:
I'm using MAPI to send an email with my Outlook add-in. Sometimes the
emails are sent with a winmail.dat attachment when sending through an
Exchange server. I'm trying to figure out how to prevent this from within
my add-in? I've read this:

http://support.microsoft.com/kb/138053

but in my case I'm adding the recipients dynamically, and they aren't in any
address book. I also don't have control over how they've configured their
Internet Mail Connector (IMC).

I'm wondering if any of these will help me?:

PR_SEND_INTERNET_ENCODING
PR_SEND_RICH_INFO
set PR_SEND_RICH_INFO = FALSE while adding recipients.
Even if you created OneOff entryid for recipient with RICH_INFO flag
PR_SEND_RICH_INFO property will override this setting.

Regards
Henry