Hello together

I currently have a macro partial (mvc rendering) that calls a HTML action of my controller and commits two parameters to the Index Action:

@{

    Html.RenderAction("Index", "ContactForm", new { mailSubject = Model.MacroParameters["mailSubject"], toMailAddress = Model.MacroParameters["mailAddress"] });

}

Unfortunately when posting back the form (I've used BeginUmbracoForm) the parameters and the macro respectively are no more available. I'm aware that I can use hidden fields or the TempData (Session) to transmit the parameters to the "SendMail" action I've created but I don't like the idea of storing the mail address in a hidden form or even in the session.

Is there a suitable way to access the macro parameters? The PartialViewMacroModel itself does not provide enought information for such a "backward" process.

Or is it even possible to implement my own macro partial view page controller? I've tried that but it seems not to be possible.

I appreciate any help. Thanks.