diff --git a/NEWS b/NEWS
index 47ab709e5..ce0354bc8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+3.1.5 (2016-MM-DD)
+------------------
+
+Enhancements
+ - [web] improve action progress when login in or sending a message (#3765, #3761)
+
 3.1.4 (2016-07-12)
 ------------------
 
diff --git a/UI/MailerUI/English.lproj/Localizable.strings b/UI/MailerUI/English.lproj/Localizable.strings
index 33f3a0b28..074d17145 100644
--- a/UI/MailerUI/English.lproj/Localizable.strings
+++ b/UI/MailerUI/English.lproj/Localizable.strings
@@ -305,7 +305,12 @@
 "Error while uploading the file \"%{0}\":" = "Error while uploading the file \"%{0}\":";
 "There is an active file upload. Closing the window will interrupt it." = "There is an active file upload. Closing the window will interrupt it.";
 
-/* Message sending */
+/* Appears while sending the message */
+"Sending" = "Sending";
+
+/* Appears when the message is successfuly sent */
+"Sent" = "Sent";
+
 "cannot send message: (smtp) all recipients discarded" = "Cannot send message: all recipients are invalid.";
 "cannot send message (smtp) - recipients discarded" = "Cannot send message. The following addresses are invalid";
 "cannot send message: (smtp) error when connecting" = "Cannot send message: error when connecting to the SMTP server.";
diff --git a/UI/MainUI/English.lproj/Localizable.strings b/UI/MainUI/English.lproj/Localizable.strings
index bcd236492..1b5376140 100644
--- a/UI/MainUI/English.lproj/Localizable.strings
+++ b/UI/MainUI/English.lproj/Localizable.strings
@@ -6,6 +6,13 @@
 "Domain" = "Domain";
 "Remember username" = "Remember username";
 "Connect" = "Connect";
+
+/* Appears while authentication is in progress */
+"Authenticating" = "Authenticating";
+
+/* Appears when authentication succeeds */
+"Success" = "Success";
+
 "Authentication Failed" = "Authentication Failed";
 "Wrong username or password." = "Wrong username or password.";
 "cookiesNotEnabled" = "You cannot login because your browser's cookies are disabled. Please enable cookies in your browser's settings and try again.";
diff --git a/UI/Templates/MailerUI/UIxMailEditor.wox b/UI/Templates/MailerUI/UIxMailEditor.wox
index fcf1f4c19..0978947d2 100644
--- a/UI/Templates/MailerUI/UIxMailEditor.wox
+++ b/UI/Templates/MailerUI/UIxMailEditor.wox
@@ -5,7 +5,7 @@
     xmlns:const="http://www.skyrix.com/od/constant"
     xmlns:label="OGo:label">
 
-  <md-dialog class="sg-mail-editor" flex="80" flex-sm="90" flex-xs="100"
+  <md-dialog id="mailEditor" class="sg-mail-editor" flex="80" flex-sm="90" flex-xs="100"
              nv-file-drop="nv-file-drop"
              nv-file-over="nv-file-over"
              over-class="sg-over-dropzone"
@@ -26,7 +26,8 @@
           </md-input-container>
           <div flex="flex"><!-- spacer --></div>
           <md-button class="sg-icon-button" ng-click="editor.send()"
-                     ng-disabled="!(editor.message.editable.to.length > 0 || editor.message.editable.cc.length > 0 || editor.message.editable.bcc.length > 0) || messageForm.$invalid">
+                     ng-disabled="!(editor.message.editable.to.length > 0 || editor.message.editable.cc.length > 0 || editor.message.editable.bcc.length > 0) || editor.uploader.isUploading || messageForm.$invalid"
+                     sg-ripple-click="mailEditor">
             <md-icon>send</md-icon>
           </md-button>
           <md-button class="sg-icon-button" ng-click="editor.save()">
@@ -254,5 +255,43 @@
         </div>
       </md-dialog-actions>
     </form>
+    <sg-ripple class="md-default-theme md-accent md-bg"
+               ng-class="{ 'md-warn': editor.sendState == 'error' }"><!-- ripple background --></sg-ripple>
+    <sg-ripple-content class="md-default-theme md-accent md-hue-1 md-fg md-flex ng-hide"
+                       layout="column" layout-align="center center" layout-fill="layout-fill"
+                       ng-switch="editor.sendState">
+
+      <!-- Sending -->
+      <div layout="column" layout-align="center center"
+           ng-switch-when="sending">
+        <md-progress-circular class="md-hue-1"
+                              md-mode="indeterminate"
+                              md-diameter="48"><!-- mailbox loading progress --></md-progress-circular>
+        <div class="md-padding">
+          <var:string label:value="Sending"/>
+        </div>
+      </div>
+
+      <!-- Sent -->
+      <div layout="column" layout-align="center center"
+           ng-switch-when="sent">
+        <md-icon class="md-accent md-hue-1 sg-icon--large">done</md-icon>
+        <div class="md-default-theme md-accent md-hue-1 md-fg md-padding">
+          <var:string label:value="Sent"/>
+        </div>
+      </div>
+
+      <!-- Error -->
+      <div layout="column" layout-align="center center"
+           ng-switch-when="error">
+        <md-icon class="md-accent md-hue-1 sg-icon--large">error</md-icon>
+        <div class="md-padding">
+          {{editor.errorMessage}}
+        </div>
+        <md-button sg-ripple-click="mailEditor"><var:string label:value="Close"/></md-button>
+      </div>
+
+    </sg-ripple-content>
+
   </md-dialog>
 </container>
diff --git a/UI/Templates/MainUI/SOGoRootPage.wox b/UI/Templates/MainUI/SOGoRootPage.wox
index 8860a4101..b8fbacbfe 100644
--- a/UI/Templates/MainUI/SOGoRootPage.wox
+++ b/UI/Templates/MainUI/SOGoRootPage.wox
@@ -9,30 +9,31 @@
     xmlns:label="OGo:label"
     const:jsFiles="Main.js, Common.js"
     >
+  <script type="text/javascript">
+    var cookieUsername = '<var:string var:value="cookieUsername" const:escapeHTML="NO"/>';
+  </script>
+
   <!--
       MAIN CONTENT ROW
       Content of the application view injected injected in the element bellow
       MUST be the first html element after body
       SHOULD  be a main tag (with role="main")
   -->
-  <main class="view layout-padding md-default-theme md-background md-hue-1 md-bg"
-        layout="row" layout-align="center start" layout-fill="layout-fill"
+  <main class="view md-default-theme md-background md-hue-1 md-bg"
+        layout-gt-md="row" layout-align-gt-md="center start" layout-fill="layout-fill"
         ui-view="login"
         ng-controller="LoginController as app">
-    <md-content class="ng-cloak md-whiteframe-z1"
-                layout-gt-md="row" layout-align-gt-md="start center"
-                layout="column" layout-align="space-between center"
-                md-scroll-y="true"
+    <md-content id="loginContent" class="ng-cloak md-whiteframe-3dp" flex="100"
+                layout="column" layout-gt-md="row" layout-align="start stretch"
                 ng-show="app.showLogin">
-      <div id="logo" class="md-padding">
-        <img const:alt="*" id="splash" rsrc:src="img/sogo-full.svg"/>
+      <div class="sg-logo" flex-gt-md="50">
+        <div layout="row" class="md-padding">
+          <div class="md-flex hide show-gt-md"><!-- push logo to the right on larger screens --></div>
+          <img const:alt="*" class="md-margin" rsrc:src="img/sogo-full.svg"/>
+        </div>
       </div>
-      <div class="sg-login md-padding md-default-theme md-bg md-accent">
-        <script type="text/javascript">
-          var cookieUsername = '<var:string var:value="cookieUsername" const:escapeHTML="NO"/>';
-        </script>
-        <div id="login">
-
+      <div class="sg-login md-default-theme md-bg md-accent" flex-gt-md="50">
+        <div id="login" class="sg-login-content md-padding">
           <form name="loginForm" layout="column"
                 ng-cloak="ng-cloak"
                 ng-submit="app.login()">
@@ -52,7 +53,7 @@
 
             <!-- CONNECT BUTTON -->
             <div layout="row" layout-align="end center">
-              <md-button class="md-raised md-accent md-hue-2" type="submit" ng-disabled='app.loginForm.$invalid'>
+              <md-button type="submit" ng-disabled='app.loginForm.$invalid' sg-ripple-click="loginContent">
                 <var:string label:value="Connect"/>
               </md-button>
             </div>
@@ -101,6 +102,43 @@
               <md-icon class="md-fg">info</md-icon>
             </md-button>
           </div>
+          <sg-ripple class="md-default-theme md-accent md-bg"
+                     ng-class="{ 'md-warn': app.loginState == 'error' }"><!-- ripple background --></sg-ripple>
+          <sg-ripple-content class="md-flex ng-hide"
+                             layout="column" layout-align="center center" layout-fill="layout-fill"
+                             ng-switch="app.loginState">
+
+            <!-- Authenticating -->
+            <div layout="column" layout-align="center center"
+                 ng-switch-when="authenticating">
+              <md-progress-circular class="md-hue-1"
+                                    md-mode="indeterminate"
+                                    md-diameter="32"><!-- mailbox loading progress --></md-progress-circular>
+              <div class="md-default-theme md-accent md-hue-1 md-fg md-padding">
+                <var:string label:value="Authenticating"/>
+              </div>
+            </div>
+
+            <!-- Logged in -->
+            <div layout="column" layout-align="center center"
+                 ng-switch-when="logged">
+              <md-icon class="md-accent md-hue-1 sg-icon--large">done</md-icon>
+              <div class="md-default-theme md-accent md-hue-1 md-fg md-padding">
+                <var:string label:value="Success"/>
+              </div>
+            </div>
+
+            <!-- Error -->
+            <div layout="column" layout-align="center center"
+                 ng-switch-when="error">
+              <md-icon class="md-accent md-hue-1 sg-icon--large">error</md-icon>
+              <div class="md-default-theme md-accent md-hue-1 md-fg md-padding">
+                {{app.errorMessage}}
+              </div>
+              <md-button sg-ripple-click="loginContent"><var:string label:value="Retry"/></md-button>
+            </div>
+
+          </sg-ripple-content>
         </div>
       </div>
     </md-content>
diff --git a/UI/WebServerResources/js/Common/sgRippleClick.directive.js b/UI/WebServerResources/js/Common/sgRippleClick.directive.js
new file mode 100644
index 000000000..eb1327880
--- /dev/null
+++ b/UI/WebServerResources/js/Common/sgRippleClick.directive.js
@@ -0,0 +1,108 @@
+/* -*- Mode: javascript; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+(function() {
+  'use strict';
+
+  angular
+    .module('SOGo.Common')
+    .directive('sgRippleClick', sgRippleClick);
+
+  /*
+   * sgRippleClick - A ripple effect to cover the parent element.
+   * @memberof SOGo.Common
+   * @restrict attribute
+   *
+   * @example:
+
+     <md-dialog id="mailEditor">
+       <md-button ng-click="editor.send()"
+                sg-ripple-click="mailEditor">Send</md-button>
+     </md-dialog>
+
+  */
+  sgRippleClick.$inject = ['$log', '$timeout'];
+  function sgRippleClick($log, $timeout) {
+
+    return {
+      restrict: 'A',
+      compile: compile
+    };
+
+    function compile(tElement, tAttrs) {
+
+      return function postLink(scope, element, attr) {
+        var ripple, content, container, containerId;
+
+        // Lookup container element
+        containerId = element.attr('sg-ripple-click');
+        container = element[0].parentNode;
+        while (container && container.id != containerId) {
+          container = container.parentNode;
+        }
+        if (!container) {
+          $log.error('No parent element found with id ' + containerId);
+          return undefined;
+        }
+
+        // Lookup sg-ripple-content element
+        content = container.querySelector('sg-ripple-content');
+        if (!content) {
+          $log.error('sg-ripple-content not found inside #' + containerId);
+          return undefined;
+        }
+
+        // Lookup sg-ripple element
+        ripple = container.querySelector('sg-ripple');
+        if (ripple) {
+          ripple = angular.element(ripple);
+        }
+        else {
+          // If ripple layer doesn't exit, create it with the primary background color
+          ripple = angular.element('<sg-ripple class="md-default-theme md-bg"></sg-ripple>');
+          container.appendChild(ripple[0]);
+
+          // Hide ripple content on initialization
+          if (!content.classList.contains('ng-hide'))
+            content.classList.add('ng-hide');
+        }
+
+        // Register listener
+        element.on('click', listener);
+        
+        function listener(event) {
+          if (element[0].hasAttribute('disabled')) {
+            return;
+          }
+
+          if (content.classList.contains('ng-hide')) {
+            // Show ripple
+            angular.element(container).css({ 'overflow': 'hidden' });
+            content.classList.remove('ng-hide');
+            angular.element(content).css({ top: container.scrollTop + 'px' });
+            ripple.css({
+	      'top': (event.pageY - container.offsetTop + container.scrollTop) + 'px',
+	      'left': (event.pageX - container.offsetLeft) + 'px',
+	      'width': '400vmin',
+	      'height': '400vmin'
+	    });
+          }
+          else {
+            // Hide ripple layer
+            ripple.css({
+              'top': (event.pageY - container.offsetTop + container.scrollTop) + 'px',
+	      'left': (event.pageX - container.offsetLeft) + 'px',
+              'height': '0px',
+              'width': '0px'
+            });
+            // Hide ripple content
+            content.classList.add('ng-hide');
+            // Restore overflow of container once the animation is completed
+            $timeout(function() {
+              angular.element(container).css({ 'overflow': '' });
+            }, 800);
+          }
+        }
+      };
+    }
+  }
+})();
diff --git a/UI/WebServerResources/js/Mailer/Message.service.js b/UI/WebServerResources/js/Mailer/Message.service.js
index fa0c1a5f2..1f3643132 100644
--- a/UI/WebServerResources/js/Mailer/Message.service.js
+++ b/UI/WebServerResources/js/Mailer/Message.service.js
@@ -636,18 +636,18 @@
 
     Message.$log.debug('send = ' + JSON.stringify(data, undefined, 2));
 
-    return Message.$$resource.post(this.$absolutePath({asDraft: true}), 'send', data).then(function(data) {
-      if (data.status == 'success') {
+    return Message.$$resource.post(this.$absolutePath({asDraft: true}), 'send', data).then(function(response) {
+      if (response.status == 'success') {
         if (angular.isDefined(_this.origin)) {
           if (_this.origin.action.startsWith('reply'))
             _this.origin.message.isanswered = true;
           else if (_this.origin.action == 'forward')
             _this.origin.message.isforwarded = true;
         }
-        return data;
+        return response;
       }
       else {
-        return Message.$q.reject(data);
+        return Message.$q.reject(response.data);
       }
     });
   };
diff --git a/UI/WebServerResources/js/Mailer/MessageEditorController.js b/UI/WebServerResources/js/Mailer/MessageEditorController.js
index 260553638..d28cf44d6 100644
--- a/UI/WebServerResources/js/Mailer/MessageEditorController.js
+++ b/UI/WebServerResources/js/Mailer/MessageEditorController.js
@@ -6,9 +6,9 @@
   /**
    * @ngInject
    */
-  MessageEditorController.$inject = ['$window', '$stateParams', '$mdConstant', '$mdDialog', '$mdToast', 'FileUploader', 'stateAccount', 'stateMessage', 'encodeUriFilter', '$timeout', 'Dialog', 'AddressBook', 'Card', 'Preferences'];
-  function MessageEditorController($window, $stateParams, $mdConstant, $mdDialog, $mdToast, FileUploader, stateAccount, stateMessage, encodeUriFilter, $timeout, Dialog, AddressBook, Card, Preferences) {
-    var vm = this, semicolon = 186;
+  MessageEditorController.$inject = ['$scope', '$window', '$stateParams', '$mdConstant', '$mdDialog', '$mdToast', 'FileUploader', 'stateAccount', 'stateMessage', 'encodeUriFilter', '$timeout', 'Dialog', 'AddressBook', 'Card', 'Preferences'];
+  function MessageEditorController($scope, $window, $stateParams, $mdConstant, $mdDialog, $mdToast, FileUploader, stateAccount, stateMessage, encodeUriFilter, $timeout, Dialog, AddressBook, Card, Preferences) {
+    var vm = this;
 
     vm.addRecipient = addRecipient;
     vm.autocomplete = {to: {}, cc: {}, bcc: {}};
@@ -19,10 +19,16 @@
     vm.cancel = cancel;
     vm.save = save;
     vm.send = send;
+    vm.sendState = false;
     vm.removeAttachment = removeAttachment;
     vm.contactFilter = contactFilter;
     vm.identities = _.map(stateAccount.identities, 'full');
-    vm.recipientSeparatorKeys = [$mdConstant.KEY_CODE.ENTER, $mdConstant.KEY_CODE.TAB, $mdConstant.KEY_CODE.COMMA, semicolon];
+    vm.recipientSeparatorKeys = [
+      $mdConstant.KEY_CODE.ENTER,
+      $mdConstant.KEY_CODE.TAB,
+      $mdConstant.KEY_CODE.COMMA,
+      $mdConstant.KEY_CODE.SEMICOLON
+    ];
     vm.uploader = new FileUploader({
       url: stateMessage.$absolutePath({asDraft: true}) + '/save',
       autoUpload: true,
@@ -54,6 +60,9 @@
       }
     });
 
+    // Destroy file uploader when the controller is being deactivated
+    $scope.$on('$destroy', function() { vm.uploader.destroy(); });
+
     if ($stateParams.actionName == 'reply') {
       stateMessage.$reply().then(function(msgObject) {
         vm.message = msgObject;
@@ -168,10 +177,13 @@
 
     function send() {
       var ctrls = $parentControllers();
+
+      vm.sendState = 'sending';
       if (vm.autosave)
         $timeout.cancel(vm.autosave);
 
       vm.message.$send().then(function(data) {
+        vm.sendState = 'sent';
         if (ctrls.draftMailboxCtrl) {
           // We're sending a draft from a popup window and the draft mailbox is opened.
           // Reload draft mailbox
@@ -192,7 +204,12 @@
             .content(l('Your email has been sent'))
             .position('top right')
             .hideDelay(3000));
-        $mdDialog.hide();
+
+        // Let the user see the succesfull message before closing the dialog
+        $timeout($mdDialog.hide, 1000);
+      }, function(response) {
+        vm.sendState = 'error';
+        vm.errorMessage = response.data? response.data.message : response.statusText;
       });
     }
 
diff --git a/UI/WebServerResources/js/Main/Main.app.js b/UI/WebServerResources/js/Main/Main.app.js
index 578daa4d0..239631e16 100644
--- a/UI/WebServerResources/js/Main/Main.app.js
+++ b/UI/WebServerResources/js/Main/Main.app.js
@@ -15,20 +15,29 @@
 
     vm.creds = { username: cookieUsername, password: null };
     vm.login = login;
+    vm.loginState = false;
     vm.showAbout = showAbout;
 
+    // Show login once everything is initialized
     vm.showLogin = false;
     $timeout(function() { vm.showLogin = true; }, 100);
 
     function login() {
+      vm.loginState = 'authenticating';
       Authentication.login(vm.creds)
         .then(function(url) {
-          if (window.location.href === url)
-            window.location.reload(true);
-          else
-            window.location.href = url;
+          vm.loginState = 'logged';
+
+          // Let the user see the succesfull message before reloading the page
+          $timeout(function() {
+            if (window.location.href === url)
+              window.location.reload(true);
+            else
+              window.location.href = url;
+          }, 1000);
         }, function(msg) {
-          Dialog.alert(l('Authentication Failed'), msg.error);
+          vm.loginState = 'error';
+          vm.errorMessage = msg.error;
         });
       return false;
     }
diff --git a/UI/WebServerResources/scss/components/ripple/ripple.scss b/UI/WebServerResources/scss/components/ripple/ripple.scss
new file mode 100644
index 000000000..2e47c956d
--- /dev/null
+++ b/UI/WebServerResources/scss/components/ripple/ripple.scss
@@ -0,0 +1,21 @@
+/// ripple.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
+
+sg-ripple {
+  border-radius: 100%;
+  height: 0px;
+  width: 0px;
+  position: absolute;
+  transition: width 800ms linear, height 800ms linear, background-color 400ms linear;
+  transform: translate(-50%, -50%);
+  opacity: 1;
+  z-index: $z-index-toolbar + 1;
+}
+
+sg-ripple-content {
+  bottom: 0;
+  left: 0;
+  position: absolute;
+  right: 0;
+  top: 0;
+  z-index: $z-index-toolbar + 2;
+}
\ No newline at end of file
diff --git a/UI/WebServerResources/scss/core/structure.scss b/UI/WebServerResources/scss/core/structure.scss
index cb7af4279..a1f8ec329 100644
--- a/UI/WebServerResources/scss/core/structure.scss
+++ b/UI/WebServerResources/scss/core/structure.scss
@@ -29,16 +29,6 @@ html * {
   }
 }
 
-.sg-logo {
-  background-image: url("../img/sogo-full.svg");
-  background-size: contain;
-  background-repeat: no-repeat;
-  height: 7 * $bl;
-  min-width: 18 * $bl;
-  //optical adjustement
-  transform: translateY(-10%);
-}
-
 .sg-category {
   position: absolute;
   top: 0;
diff --git a/UI/WebServerResources/scss/styles.scss b/UI/WebServerResources/scss/styles.scss
index 945eae8a7..957fe140a 100755
--- a/UI/WebServerResources/scss/styles.scss
+++ b/UI/WebServerResources/scss/styles.scss
@@ -66,6 +66,7 @@
 @import 'components/whiteframe/whiteframe';
 
 // Inverse components
+@import 'components/ripple/ripple';
 @import 'components/timepicker/timepicker';
 
 // @import '../angular-material/src/core/style/color-palette';
diff --git a/UI/WebServerResources/scss/views/LoginUI.scss b/UI/WebServerResources/scss/views/LoginUI.scss
index 9b42ed9f4..b29f42f06 100644
--- a/UI/WebServerResources/scss/views/LoginUI.scss
+++ b/UI/WebServerResources/scss/views/LoginUI.scss
@@ -1,46 +1,76 @@
 /// LoginUI.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
 
+$sg-login-width: grid-step(5);
+
 [ui-view="login"] {
   md-content {
-    padding: 0;
-    @include to(sm) {
-      [id=logo] {
-        text-align: center;
+    // Keep content centered
+    margin: auto;
+
+    .sg-logo img {
+      width: grid-step(5);
+    }
+
+    /**
+     * On small screens, we dispose the logo and login form as column.
+     */
+    @include to(md) {
+      & {
+        // Fill the screen
+        min-height: 100%;
+      }
+      .sg-logo {
+        // Center content
+        margin: auto;
         img {
+          margin: auto;
+          height: 100%;
           max-width: 75%;
         }
       }
+      .sg-login {
+        // Let the form take all available space
+        flex-grow: 1;
+        margin: 0;
+      }
+      .sg-login-content {
+        margin: auto;
+        max-width: $sg-login-width;
+      }
     }
-    @include from(sm) {
+
+    /**
+     * On larger screen, we dispose the logo and login form as a row.
+     */
+    @include from(md) {
       &.ng-hide {
-        [id=logo] {
+        .sg-logo img {
           opacity: 0;
-          transform: translateX(50%);
+          transform: translateX($sg-login-width/2 + $baseline-grid + $baseline-grid*2);
         }
         .sg-login {
           opacity: 0;
           transform: translateX(100%);
         }
       }
-      [id=logo], .sg-login {
+      .sg-logo img, .sg-login {
         opacity: 1;
-        //transform: translateX(0%);
       }
-      [id=logo] {
-        transition: transform $swift-ease-out-duration $swift-ease-out-timing-function 600ms,
-        opacity 400ms linear;
+      .sg-logo {
+        max-height: 100%;
+        max-width: 50%;
+        img {
+          transition: transform $swift-ease-out-duration $swift-ease-out-timing-function 600ms,
+          opacity 400ms linear;
+        }
       }
       .sg-login {
+        max-width: 50%;
         transition: all $swift-ease-out-duration $swift-ease-out-timing-function 600ms;
       }
-    }
+      .sg-login-content {
+        width: $sg-login-width;
+      }
+    } // from(md)
   }
 }
-
-[ui-view="login"] > md-content > div {
-  width: grid-step(5);
-}
-
-[id=logo] img {
-  max-width: 100%;
-}