Add setting for mail from validation

Fixes #454

src/views/email.html

@@ -474,7 +474,22 @@
           </div>
       </uib-tab>
 
-      <uib-tab index="2" heading="Status">
+      <uib-tab index="2" heading="Settings">
+          <div class="card card-large" style="margin-bottom: 15px;">
+              <h4>Enable Masquerading</h4>
+
+              <div class="row">
+                <div class="col-md-10">
+                    Masquerading allows users and apps to send emails with an arbitrary username in the FROM address
+                </div>
+                <div class="col-md-2">
+                  <button ng-class="selectedDomain.mailConfig.mailFromValidation ? 'btn btn-danger' : 'btn btn-primary'" ng-click="toggleMailFromValidation()">{{ selectedDomain.mailConfig.mailFromValidation ? "Enable" : "Disable" }}</button>
+                </div>
+              </div>
+          </div>
+      </uib-tab>
+
+      <uib-tab index="3" heading="Status">
         <div class="card card-large" style="margin-bottom: 15px;" ng-show="selectedDomain.provider !== 'caas' && selectedDomain.mailConfig.relay.provider === 'cloudron-smtp'">
           <div class="row">
             <div class="col-md-12">

src/views/email.js

@@ -181,6 +181,13 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
         }
     };
 
+    $scope.toggleMailFromValidation = function () {
+        Client.setMailFromValidation($scope.selectedDomain.domain, !$scope.selectedDomain.mailConfig.mailFromValidation, function (error) {
+            if (error) return console.error(error);
+            $scope.refreshDomain();
+        });
+    };
+
     $scope.toggleEmailEnabled = function () {
         if ($scope.selectedDomain.mailConfig.enabled) {
             $('#disableEmailModal').modal('show');