diff --git a/.classpath b/.classpath
index cfbe319..26b9e5f 100644
--- a/.classpath
+++ b/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="src" output="target/register-vre-users-1.3.0-SNAPSHOT/WEB-INF/classes" path="src/main/java">
+	<classpathentry kind="src" output="target/register-vre-users-1.4.0-SNAPSHOT/WEB-INF/classes" path="src/main/java">
 		<attributes>
 			<attribute name="optional" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
@@ -31,5 +31,5 @@
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="output" path="target/register-vre-users-1.3.0-SNAPSHOT/WEB-INF/classes"/>
+	<classpathentry kind="output" path="target/register-vre-users-1.4.0-SNAPSHOT/WEB-INF/classes"/>
 </classpath>
diff --git a/.settings/org.eclipse.wst.common.component b/.settings/org.eclipse.wst.common.component
index 7aaf430..7f8bd6a 100644
--- a/.settings/org.eclipse.wst.common.component
+++ b/.settings/org.eclipse.wst.common.component
@@ -5,6 +5,9 @@
     <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/target/generated-sources/gwt"/>
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/resources"/>
+        <dependent-module archiveName="invites-common-library-1.0.0-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/invites-common-library/invites-common-library">
+            <dependency-type>uses</dependency-type>
+        </dependent-module>
     <property name="java-output-path" value="/${module}/target/www/WEB-INF/classes"/>
         <property name="context-root" value="register-vre-users"/>
   </wb-module>
diff --git a/pom.xml b/pom.xml
index 8f0486d..fe44161 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 	<groupId>org.gcube.portlets.admin</groupId>
 	<artifactId>register-vre-users</artifactId>
 	<packaging>war</packaging>
-	<version>1.3.0-SNAPSHOT</version>
+	<version>1.4.0-SNAPSHOT</version>
 	<name>Register VRE Users</name>
 	<description>
 		Rigister VRE Users Portlet allow to select a user from the portal and add her to the VRE.
@@ -72,6 +72,11 @@
 			<artifactId>custom-portal-handler</artifactId>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.gcube.portal</groupId>
+			<artifactId>notifications-common-library</artifactId>
+			<version>[1.1.0-SNAPSHOT, 2.0.0-SNAPSHOT)</version>
+		</dependency>
 		<dependency>
 			<groupId>org.gcube.applicationsupportlayer</groupId>
 			<artifactId>aslsocial</artifactId>
@@ -114,7 +119,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.gcube.core</groupId>
-			<artifactId>common-scope-maps</artifactId>			
+			<artifactId>common-scope-maps</artifactId>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
@@ -130,7 +135,7 @@
 		</dependency>
 		<dependency>
 			<groupId>com.liferay.portal</groupId>
-			<artifactId>portal-service</artifactId>		
+			<artifactId>portal-service</artifactId>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
diff --git a/src/main/java/org/gcube/portlets/admin/manageusers/server/ManageUsersServiceImpl.java b/src/main/java/org/gcube/portlets/admin/manageusers/server/ManageUsersServiceImpl.java
index 7f86069..39a7796 100644
--- a/src/main/java/org/gcube/portlets/admin/manageusers/server/ManageUsersServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/admin/manageusers/server/ManageUsersServiceImpl.java
@@ -1,11 +1,7 @@
 package org.gcube.portlets.admin.manageusers.server;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Properties;
 
 import org.gcube.application.framework.core.session.ASLSession;
 import org.gcube.application.framework.core.session.SessionManager;
@@ -15,6 +11,7 @@ import org.gcube.common.homelibrary.home.HomeLibrary;
 import org.gcube.common.homelibrary.home.workspace.Workspace;
 import org.gcube.portal.custom.communitymanager.OrganizationsUtil;
 import org.gcube.portal.custom.scopemanager.scopehelper.ScopeHelper;
+import org.gcube.portal.notifications.thread.MessageNotificationsThread;
 import org.gcube.portlets.admin.manageusers.client.ManageUsersService;
 import org.gcube.portlets.admin.manageusers.shared.PortalUserDTO;
 import org.gcube.vomanagement.usermanagement.GroupManager;
@@ -42,8 +39,6 @@ public class ManageUsersServiceImpl extends RemoteServiceServlet implements  Man
 
 	private GroupManager groupM = new LiferayGroupManager();
 	private UserManager userM = new LiferayUserManager();
-	//this prop is needed for expando attributes
-	private static final String ADMIN_USERNAME = "administratorUsername";
 	
 	private final static String POSITION = "POSITION";
 	private final static String LABS = "LABS";
@@ -102,7 +97,6 @@ public class ManageUsersServiceImpl extends RemoteServiceServlet implements  Man
 	 * 
 	 * @return A list with the username of the unregistered users
 	 */
-	@SuppressWarnings("unchecked")
 	public ArrayList<PortalUserDTO> getNonBelongingUsersForVRE() {
 
 		try {
@@ -174,17 +168,20 @@ public class ManageUsersServiceImpl extends RemoteServiceServlet implements  Man
 	private boolean sendNotificationToUser(PortalUserDTO addressee) throws Exception {
 		ASLSession session = getASLSession();
 		Workspace workspace = HomeLibrary.getUserWorkspace(session.getUsername());
-		ArrayList<String> toSend = new ArrayList<String>();
-		toSend.add(addressee.getId());
+
+		List<String> recipientIds = new ArrayList<String>();
+		recipientIds.add(addressee.getId());
+		
 		String subject = "Registration to Group Notification";
 		String body = "Dear "+addressee.getName()+", \n\n" + session.getUserFullName() + " has registered you to the group " + getASLSession().getGroupName()+".";
-		workspace.getWorkspaceMessageManager().sendMessageToPortalLogins(subject, body, new ArrayList<String>(), toSend);
-		NotificationsManager nnm = new ApplicationNotificationsManager(getASLSession());
-		if (nnm.notifyMessageReceived(addressee.getId(), subject)) {
-			_log.trace("Sent Notification: " + subject + " OK");
-			return true;
-		}
-		return false;		
+		String messageId = workspace.getWorkspaceMessageManager().sendMessageToPortalLogins(subject, body, new ArrayList<String>(), recipientIds);
+		
+		_log.debug("Sending message notification to: " + recipientIds.toString());
+		NotificationsManager nm = new ApplicationNotificationsManager(getASLSession());
+		Thread thread = new Thread(new MessageNotificationsThread(recipientIds, messageId, subject, body, nm));
+		thread.start();
+
+		return (messageId != null);		
 	}
 
 	/**