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

Any tips would be greatly appreciated.

Thanks,
Mark
http://www.email-announcer.com