New: Add option to foce delivery receipt to yes

htdocs/core/class/html.formmail.class.php

@@ -474,7 +474,11 @@ class FormMail
         		}
         		else
         		{
-        			$out.= $form->selectyesno('deliveryreceipt', (isset($_POST["deliveryreceipt"])?$_POST["deliveryreceipt"]:0), 1);
+        			$defaultvaluefordeliveryreceipt=0;
+        			if (! empty($conf->global->MAIL_FORCE_DELIVERY_RECEIPT_INVOICE) && ! empty($this->param['models']) && $this->param['models'] == 'facture_send') $defaultvaluefordeliveryreceipt=1;
+        			if (! empty($conf->global->MAIL_FORCE_DELIVERY_RECEIPT_ORDER) && ! empty($this->param['models']) && $this->param['models'] == 'commande_send') $defaultvaluefordeliveryreceipt=1;
+        			if (! empty($conf->global->MAIL_FORCE_DELIVERY_RECEIPT_PROPAL) && ! empty($this->param['models']) && $this->param['models'] == 'propal_send') $defaultvaluefordeliveryreceipt=1;
+        			$out.= $form->selectyesno('deliveryreceipt', (isset($_POST["deliveryreceipt"])?$_POST["deliveryreceipt"]:$defaultvaluefordeliveryreceipt), 1);
         		}
 
         		$out.= "</td></tr>\n";