How to embed HTML into a C# component

I am creating a webmail solution and need to be able to display HTML e-
mails in a placeholder without screwing up the styling of the rest of
the page. I know that I could use an iframe to do this, but the
problem that I am running into is that iframe's require a src which
points to a file, I don't have an HTML file to display I just have the
text of the e-mail. Any suggestions for the best way to solve this
problem?
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