BeginForm method has several overloads.
In order to set the action attribute on the form tag with the desired url, you need to use following overload of BeginForm:
BeginForm(String, String, FormMethod, IDictionary<String, Object>)
// here are the parameter names:
BeginForm(actionName, controllerName, method, htmlAttributes)
Since you want to post to an external site, there is no need to set actionName and controllerName, just leave them as null.
@Html.BeginForm(
null, null, FormMethod.Post, new {@action="http://cnn.com/post"}
)
This will not encode the action parameter.
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