MVC Html.Raw Issue

Question

I need to display emails. I have a list of subjects and each is a link. User clicks on the link and the email displays. The emails are in a SQL table and in HTML format.

The site is a secure https site and when I use Html.Raw to render the html the site's is no longer secure, padlock icon gone and site details indicate contents no longer secure.

How can I render html securely? Is there a safe alternative to Html.Raw.