diff --git a/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email-anb.php b/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email-anb.php
index 98981ecb8..62d3bc972 100644
--- a/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email-anb.php
+++ b/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email-anb.php
@@ -13,6 +13,10 @@ $period = "monthly";
 $netowner_config = TT_PREORDER_BILLING[$invoice->netowner_id];
 $netoperator_config = $netowner_config["netoperators"][$invoice->owner_id];
 
+if($netoperator_config["billing-period"] == "quarterly") {
+    $period = "quarterly";
+}
+
 if($period == "monthly") {
     $fmt = new IntlDateFormatter(
         MFLOCALE_TIME,
diff --git a/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email.php b/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email.php
index ee0a6bbe8..951f247a4 100644
--- a/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email.php
+++ b/Layout/default/Emailtemplates/preorder-invoice/rml/invoice-email.php
@@ -5,7 +5,7 @@
 $this->setReturnValue([
     'subject' => "Ihre ".(($invoice->total < 0) ? "Gutschrift" : "Rechnung" )." ".$invoice->invoice_number,
     'from_email' => "no-reply@rmlinfrastruktur.at",
-    'from_email_name' => "Verrechnung | RML Infrastruktur GmbH"
+    'from_email_name' => "Rechnung | RML Infrastruktur GmbH"
 ]);
 ?>
 Sehr geehrte Damen und Herren,
diff --git a/Layout/default/PreorderBillingInvoice/Index.php b/Layout/default/PreorderBillingInvoice/Index.php
index 9ea26c862..c7287b3bf 100644
--- a/Layout/default/PreorderBillingInvoice/Index.php
+++ b/Layout/default/PreorderBillingInvoice/Index.php
@@ -175,6 +175,7 @@ $pagination_entity_name = "Rechnungen";
                                     <th>Brutto</th>
                                     <th>Versendet</th>
                                     <th>Erstellt</th>
+                                    <th></th>
                                 </tr>
                                 <?php foreach($invoices as $invoice): ?>
                                     <tr>
@@ -207,6 +208,9 @@ $pagination_entity_name = "Rechnungen";
                                             <?=$invoice->creator->name?><br />
                                             <?=date("d.m.Y H:i", $invoice->create)?>
                                         </td>
+                                        <td>
+                                            <a href="#" onclick="openSendCopyModal(<?=$invoice->id?>); return false;" title="Rechungskopie versenden"><i class="fas fa-fw fa-paper-plane"></i></a>
+                                        </td>
                                     </tr>
                                 <?php endforeach; ?>
                             </table>
@@ -227,6 +231,32 @@ $pagination_entity_name = "Rechnungen";
 
     </div>
 
+    <div class="modal fade" id="sendCopyModal" tabindex="-1" aria-labelledby="sendCopyModalLabel" aria-hidden="true">
+        <div class="modal-dialog">
+            <div class="modal-content">
+                <form method="post" action="<?=self::getUrl("PreorderBillingInvoice", "sendCopy")?>">
+                    <input type="hidden" name="id" value="" />
+                    <div class="modal-header">
+                        <h5 class="modal-title" id="sendCopyModalLabel">Rechungskopie versenden</h5>
+                        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+                            <span aria-hidden="true">&times;</span>
+                        </button>
+                    </div>
+                    <div class="modal-body">
+                        <div class="form-group">
+                            <label for="recipient-name" class="col-form-label">Empfänger Emailadresse:</label>
+                            <input type="text" class="form-control email_to" name="email_to">
+                        </div>
+                    </div>
+                    <div class="modal-footer">
+                        <button type="button" class="btn btn-secondary" data-dismiss="modal">Abbrechen</button>
+                        <button type="submit" class="btn btn-primary">Rechnungskopie versenden</button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+
     <script>
         $("#filter_start_date_from").datepicker({
             orientation: "bottom",
@@ -253,6 +283,12 @@ $pagination_entity_name = "Rechnungen";
             autoclose: true
         });
 
+        function openSendCopyModal(id) {
+            $('#sendCopyModal input[name="id"]').val(id);
+            $('#sendCopyModal input[name="email_to"]').val("");
+            $('#sendCopyModal').modal();
+        }
+
         var status_update;
 
         function updateStatus() {
diff --git a/application/PreorderBillingInvoice/PreorderBillingInvoiceController.php b/application/PreorderBillingInvoice/PreorderBillingInvoiceController.php
index d1454e3fd..cebbf2286 100644
--- a/application/PreorderBillingInvoice/PreorderBillingInvoiceController.php
+++ b/application/PreorderBillingInvoice/PreorderBillingInvoiceController.php
@@ -666,6 +666,31 @@ class PreorderBillingInvoiceController extends mfBaseController {
         $this->redirect("PreorderBillingInvoice");
     }
 
+    protected function sendCopyAction() {
+        $id = $this->request->id;
+        if(!is_numeric($id) || $id < 1) {
+            $this->layout()->setFlash("Rechnung nicht gefunden", "error");
+            $this->redirect("PreorderBillingInvoice");
+        }
+
+        $invoice = new PreorderBillingInvoice($id);
+        if(!$invoice->id) {
+            $this->layout()->setFlash("Rechnung nicht gefunden", "error");
+            $this->redirect("PreorderBillingInvoice");
+        }
+
+        $email = trim($this->request->email_to);
+        if(!$email) {
+            $this->layout()->setFlash("Ungültige Emailadresse", "error");
+            $this->redirect("PreorderBillingInvoice");
+        }
+
+        $invoice->sendByEmail($email);
+
+        $this->layout()->setFlash("Rechnungskopie erfolgreich versendet", "success");
+        $this->redirect("PreorderBillingInvoice");
+    }
+
     public function _sendEmailInvoices($limit = false) {
         $sent = 0;
         $defer = 0;