I don't know the details of the steps you have already taken, but, I would suggest that you check the Server Configuration document for the SMTP server. Check the Message Content Field which is located on the Outbound Tab, under the Conversion Options tab, on the MIME tab. You will probably find that it is set for "Create multi-part alternative including conversion and encapsulation". This will cause the result you are finding. Change this field to "Convert from Notes to Internet message format" and it should solve your problem.
Dig Deeper on Domino Resources - Part 6
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