The comments on how Outlook handles HTML messages came from MS Tech Support. In our application we use MS Word to create an HTML file. We then use the FileToStr function to set the HTMLBody property. Call Display then Send. I have Outlook configured to send mail as HTML.

Have you had any luck yet?

>Well, now you have mentioned a couple of things that might be causing some problem. You said the HTMLeditor will convert the message to RTF. I have my Outlook configuration set to send mail as HTML. Should I set it to send mail as RTF ? Also, when we create the HTML message (in MSWord) we save it as an HTM file. Should we be saving it as an RTF file ?
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>>It should work. We have implemented this is some of our systems. We experienced the exact same problem at the start. Here is a copy of the response that I received from Microsoft.
>>
>>--------
>>The way you see is by design and when you call Display before Send,
>>Outlook will call HTMLEditor to interpreter the HTML body and convert it
>>into RTF then send it out. The Yahoo and Hotmail mail servers are able
>>to understand RTF and display it correctly. On the other hands, if you
>>call Send directly, no HTMLEditor gets involved and Yahoo and Hotmail
>>mail servers don't how to handle such stream and as the results, they
>>will display it as plain text...
>>