Allow email to be enabled without dns setup

This helps in importing existing mail and also configuring mailboxes
before going live

src/views/email.js

@@ -189,6 +189,8 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
 
     $scope.incomingEmail = {
         busy: false,
+        setupDns: true,
+        setupDnsBusy: false,
 
         toggleEmailEnabled: function () {
             if ($scope.selectedDomain.mailConfig.enabled) {
@@ -198,6 +200,18 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
             }
         },
 
+        setDnsRecords: function (callback) {
+            $scope.incomingEmail.setupDnsBusy = true;
+
+            Client.setDnsRecords($scope.selectedDomain.domain, function (error) {
+                if (error) console.error(error);
+
+                $timeout(function () { $scope.incomingEmail.setupDnsBusy = false; }, 2000); // otherwise, it's too fast
+
+                if (callback) callback();
+            });
+        },
+
         enable: function () {
             $('#enableEmailModal').modal('hide');
 
@@ -208,7 +222,9 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
 
                 $scope.reconfigureEmailApps();
 
-                Client.setDnsRecords($scope.selectedDomain.domain, function (error) {
+                let maybeSetupDns = $scope.incomingEmail.setupDns ? $scope.incomingEmail.setDnsRecords : function (next) { next(); };
+
+                maybeSetupDns(function (error) {
                     if (error) return console.error(error);
 
                     $scope.refreshDomain();