Discount coupon email HTML/CSS

[kjoshi]

Have you tested whether that same recipient receives any *other* emails from your store in HTML format?

Thanks once again DrByte. Yes, just tried sending *other* emails to the test account and they are also non-HTML. But when I goto Admin>Customers>Edit, I can see "HTML" is checked for "Email format option (Please see attached screen shot)

It is clear that the system is sending text only emails inspite of "Use MIME type HTML" set to true under Admin>Catalog>Email Options.

I wonder what might be causing this bug...