Are you saying the offshore code monkeys can't supply a fix or that there is no source code available to fix yourself? That is madness!
If you can intercept the email before it reaches the mail server, you could create a simple program to add the <html> tag in using a regular expression.
Does the app send email via SMTP? If so, create a listener SMTP service in C# that uses the regex to fix the text before sending it on to the correct SMTP server.
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By the time you finish reading this sentence, the national debt will have risen by another £1,500 - which you or your children will have to repay.
Just so you know.
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