How to HTML Email using Simple MAPI Interface

I have C++ Simple MAPI routines for sending emails. This works well for straight text emails. I have prepared a HMTL body for emailing but do not know how to flag the fact that the body is HTML to the client when using Simple MAPI.

Can this be done with Simple MAPI ?

If it can't be done using Simple MAPI how is it done using an alternative.
Let's start with Extended MAPI before moving on to something super sophisticated.
Try to keep it simple. I'm only looking at sending a single email body with simple HTML.

Thanks

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