Uses r2hconv
....
procedure Tfrm.EnviaCorreoClick(Sender: TObject);
var strOrigen: string;
begin
inherited;
redtMail.lines.SaveToFile('c:\temp.rtf');
r2hconv.rtf2html('c:\temp.rtf', 'c:\temp.htm', ['']);
redtHTML.Lines.LoadFromFile('c:\temp.htm');
redtHTML.Lines.Add('