diff --git a/.classpath b/.classpath
index 87114c5..cbad3c9 100644
--- a/.classpath
+++ b/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="src" output="target/join-vre-3.0.0-SNAPSHOT/WEB-INF/classes" path="src/main/java">
+	<classpathentry kind="src" output="target/join-vre-3.0.1-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/join-vre-3.0.0-SNAPSHOT/WEB-INF/classes"/>
+	<classpathentry kind="output" path="target/join-vre-3.0.1-SNAPSHOT/WEB-INF/classes"/>
 </classpath>
diff --git a/distro/changelog.xml b/distro/changelog.xml
index 89bca21..057973c 100644
--- a/distro/changelog.xml
+++ b/distro/changelog.xml
@@ -1,18 +1,28 @@
 <ReleaseNotes>
-	<Changeset component="org.gcube.portlets-user.join-vre.3.0.0" date="2016-03-28">
+	<Changeset component="org.gcube.portlets-user.join-vre.3.0.1"
+		date="2016-08-25">
+		<Change>Fix for Bug #4877 Email Notification sent multiple times
+			sometimes</Change>
+	</Changeset>
+	<Changeset component="org.gcube.portlets-user.join-vre.3.0.0"
+		date="2016-03-28">
 		<Change>Ported to Liferay 6.2</Change>
 	</Changeset>
 	<Changeset component="org.gcube.portlets-user.join-vre.2.0.0"
 		date="2015-10-22">
 		<Change>Refactored to support virtual groups and related descriptions
-			through LR Custom Field</Change>
+			through LR Custom Field
+		</Change>
 		<Change>Refactored with GWT Bootstrap, new look and feel</Change>
-		<Change>Added support for showing external hosted VREso, see Feature #755</Change>
+		<Change>Added support for showing external hosted VREso, see Feature
+			#755
+		</Change>
 	</Changeset>
 	<Changeset component="org.gcube.portlets-user.join-vre.1.1.0"
 		date="2015-04-28">
 		<Change>Redesigned and restyles the way vre description is shown to
-			end users</Change>
+			end users
+		</Change>
 	</Changeset>
 	<Changeset component="org.gcube.portlets-user.join-vre.1.0.0"
 		date="2015-03-02">
diff --git a/pom.xml b/pom.xml
index da36a07..26dcaad 100644
--- a/pom.xml
+++ b/pom.xml
@@ -13,7 +13,7 @@
 	<groupId>org.gcube.portlets.user</groupId>
 	<artifactId>join-vre</artifactId>
 	<packaging>war</packaging>
-	<version>3.0.0-SNAPSHOT</version>
+	<version>3.0.1-SNAPSHOT</version>
 	<name>gCube Join VRE Portlet</name>
 	<description>Display the available VRE to Join</description>
 	<scm>
diff --git a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessVREDialog.java b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessVREDialog.java
index 78c6183..aeff180 100644
--- a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessVREDialog.java
+++ b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessVREDialog.java
@@ -57,6 +57,7 @@ public class AccessVREDialog extends Composite {
 	void confirm(ClickEvent e) {
 		helpBlock.setText("Registering to " + myVRE.getName() + " please wait ... ");
 		loading.setVisible(true);
+		confirmRequest.setEnabled(false);
 		joinService.registerUser(myVRE.getinfraScope(), myVRE.getId(), IS_INVITATION, new AsyncCallback<Boolean>() {
 			
 			@Override
diff --git a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessViaInviteDialog.java b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessViaInviteDialog.java
index 7854798..a280576 100644
--- a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessViaInviteDialog.java
+++ b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/AccessViaInviteDialog.java
@@ -77,6 +77,7 @@ public class AccessViaInviteDialog extends Composite {
 	void confirm(ClickEvent e) {
 		helpBlock.setText("Registering to " + myVRE.getName() + " please wait ... ");
 		loading.setVisible(true);
+		confirmRequest.setEnabled(false);
 		joinService.registerUser(myVRE.getinfraScope(), myVRE.getId(), IS_INVITATION, new AsyncCallback<Boolean>() {
 			
 			@Override
diff --git a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/RequestMembershipDialog.java b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/RequestMembershipDialog.java
index 1516098..28182e9 100644
--- a/src/main/java/org/gcube/portlets/user/joinvre/client/ui/RequestMembershipDialog.java
+++ b/src/main/java/org/gcube/portlets/user/joinvre/client/ui/RequestMembershipDialog.java
@@ -54,7 +54,8 @@ public class RequestMembershipDialog extends Composite  {
 	}
 	@UiHandler("confirmRequest")
 	void confirm(ClickEvent e) {
-		String text = optionalText.getText();		
+		String text = optionalText.getText();	
+		confirmRequest.setEnabled(false);
 		joinService.addMembershipRequest(myVRE.getinfraScope(), text, new AsyncCallback<Void>() {			
 			@Override
 			public void onSuccess(Void result) {