diff --git a/webadmin/src/views/users.html b/webadmin/src/views/users.html
index c7c496ee2..375d0e9dd 100644
--- a/webadmin/src/views/users.html
+++ b/webadmin/src/views/users.html
@@ -122,11 +122,15 @@
                         </div>
                         <div ng-show="groups.length <= 1">No groups available.</div>
                     </div>
-                    <div class="form-group" ng-show="useredit.userInfo.username && mailConfig.enabled">
+                    <div class="form-group" ng-show="useredit.userInfo.username && mailConfig.enabled" ng-class="{ 'has-error': useredit.error.aliases }">
                         <label class="control-label">Email aliases</label>
 
+                        <div class="control-label" ng-show="useredit.error.aliases">
+                            <small>{{ useredit.error.aliases }}</small>
+                        </div>
+
                         <div class="input-group form-inline">
-                            <tag-input class="form-group form-control" placeholder='Separate aliases by comma' taglist='useredit.aliases'></tag-input>
+                            <tag-input class="form-group form-control" placeholder='Separate aliases by comma' taglist='useredit.aliases' name="aliases"></tag-input>
                             <div class="input-group-addon">
                                     @{{ config.fqdn }}
                             </div>
diff --git a/webadmin/src/views/users.js b/webadmin/src/views/users.js
index 2fc9ee2ca..0f387df23 100644
--- a/webadmin/src/views/users.js
+++ b/webadmin/src/views/users.js
@@ -158,7 +158,7 @@ angular.module('Application').controller('UsersController', ['$scope', '$locatio
         superuser: false,
 
         show: function (userInfo) {
-            $scope.useredit.error.email = null;
+            $scope.useredit.error = {};
             $scope.useredit.email = userInfo.alternateEmail || userInfo.email;
             $scope.useredit.userInfo = userInfo;
             $scope.useredit.groupIds = angular.copy(userInfo.groupIds);
@@ -188,7 +188,7 @@ angular.module('Application').controller('UsersController', ['$scope', '$locatio
         },
 
         submit: function () {
-            $scope.useredit.error.email = null;
+            $scope.useredit.error = {};
             $scope.useredit.busy = true;
 
             var data = {
@@ -229,7 +229,16 @@ angular.module('Application').controller('UsersController', ['$scope', '$locatio
                     setAliasesFunc(function (error) {
                         $scope.useredit.busy = false;
 
-                        if (error) return console.error('Unable to update aliases for user:', error);
+                        if (error) {
+                           if (error.statusCode === 400) {
+                                $scope.useredit.error.aliases = 'One or more aliases is invalid';
+                            } else if (error.statusCode === 409) {
+                                $scope.useredit.error.aliases = 'One or more aliases already taken';
+                            } else {
+                                console.error('Unable to update aliases for user:', error);
+                            }
+                            return;
+                        }
 
                         $scope.useredit.userInfo = {};
                         $scope.useredit.email = '';