That looks complete, but run together like that makes it VERY difficult to read and interpret — Not your fault or the fault of Mail some developers take out all the carriage returns in html to save a few characters in the download which appears to have happened here.
As I said previously, it has been a long time since I have seen this, but IIRC the problem was finally diagnosed as spurious non-printable control characters preventing the rendering engine from identifying the html code so the message was treated as text and not html. With that in mind I resorted to Google and came up with
this Apple KB article you might try. I don't have high hopes in your case, but it is easy enough and might help.
