Back in 2008, I wrote a little VB6 test application to test sending a sample message using the three methods:
2. CDO 1.21
3. The Outlook Object Model
At the request of some co-workers, I am going to post that sample here. It is not supported and is intended to be just an example of how you might write your own test application. Actually if you were going to write one today, it would probably make sense to use vb.net and some newer code, but this can still serve as a sample. I can make no guarantees that it works in all situations, so use it at your own risk.