How I can send mail with MAPI Extended

Hi,
I am trying to send a simple mail with MAPI extended, but I don't find any sample and I don't get do nothing. I do this:

...
// Initialize MAPI Subsystem.
hr = MAPIInitialize(NULL);
hr = MAPILogonEx(0,NULL,NULL,MAPI_LOGON_UI|MAPI_EXTENDED ,&lpSession);

But after this I don't know how I can send one mail, I don't know how I can create a IMessage. I don't need search the address, I only want send one mail.

Can any help me? Thanks.