Hurray, solved my problem for main-customer: <input name="CustomerKey_1" id="CustomerKey_1" class="CustomerKey" type="hidden" value="mymail@mail.com"> <input class="CustomerTicketText" title="An Kundenbenutzer" name="CustomerTicketText_1" id="CustomerTicketText_1" type="hidden" value="mymail@mail.com" readonly="readonly" area-invalid="false"> One step closer! Just the problem with more than one CC-Field is left!