Answer by  
                                                                                          karenkay (343)
                                                            
                          
                          
                                                          You should respond to a wedding invitation in kind. That is, if the invitation was mailed, respond by mail. If it was e-mailed, respond by e-mail. If you respond by e-mail, do not change the subject header, as this will confuse the recipient. If you decide to respond by e-mail because of a late decision, make your subject header clear.