diff --git a/src/main/java/org/gcube/portal/socialmail/PeriodicTask.java b/src/main/java/org/gcube/portal/socialmail/PeriodicTask.java
index a1f8c0e..c69b7f1 100644
--- a/src/main/java/org/gcube/portal/socialmail/PeriodicTask.java
+++ b/src/main/java/org/gcube/portal/socialmail/PeriodicTask.java
@@ -57,9 +57,9 @@ import org.gcube.portal.notifications.thread.MessageNotificationsThread;
 import org.gcube.vomanagement.usermanagement.UserManager;
 import org.gcube.vomanagement.usermanagement.impl.LiferayUserManager;
 import org.gcube.vomanagement.usermanagement.model.GCubeUser;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
+import com.liferay.portal.kernel.log.Log;
+import com.liferay.portal.kernel.log.LogFactoryUtil;
 import com.sun.mail.util.MailSSLSocketFactory;
 
 /**
@@ -68,7 +68,7 @@ import com.sun.mail.util.MailSSLSocketFactory;
  *
  */
 public class PeriodicTask implements Runnable {
-	private static final Logger _log = LoggerFactory.getLogger(PeriodicTask.class);
+	private static final Log _log = LogFactoryUtil.getLog(PeriodicTask.class);
 	private static final String APP_ID_NEWSFEED =  "org.gcube.portlets.user.newsfeed.server.NewsServiceImpl";
 
 	private DatabookStore socialStore;
@@ -89,7 +89,7 @@ public class PeriodicTask implements Runnable {
 
 	@Override
 	public void run() {
-		_log.info("PeriodicTask starting for portal/site having name: " + popAccount.getPortalName());
+		_log.debug("PeriodicTask starting for portal/site having name: " + popAccount.getPortalName());
 		check(popAccount.getPortalName(), popAccount.getPop3Server(), popAccount.getPop3user(), popAccount.getPop3password());
 
 	}
@@ -250,7 +250,7 @@ public class PeriodicTask implements Runnable {
 			e1.printStackTrace();
 		}
 
-		_log.debug("Found message reply, subject: " + subject, " body: " + messageText);
+		_log.debug("Found message reply, subject: " + subject + " body: " + messageText);
 		String newMessageId = null;
 		Workspace workspace;
 		List<String> recipientIds = null;
@@ -274,14 +274,14 @@ public class PeriodicTask implements Runnable {
 			_log.debug("Constructing reply message");
 			messageText += getReplyHeaderMessage(sender, originalSentTime, originalText);
 			
-			_log.debug("Trying to send message with subject: " + subject, " to: " + recipientIds.toString());
+			_log.debug("Trying to send message with subject: " + subject + " to: " + recipientIds.toString());
 			newMessageId = messageManager.sendMessageToPortalLogins(subject, messageText, new ArrayList<String>(), recipientIds);
 
 		} catch (WorkspaceFolderNotFoundException | InternalErrorException	| HomeNotFoundException | ItemNotFoundException e) {
 			e.printStackTrace();
 		}
 
-		_log.debug("Message with subject: " + subject, " hase been sent, returned id: " + newMessageId);
+		_log.debug("Message with subject: " + subject + " hase been sent, returned id: " + newMessageId);
 
 		if (newMessageId != null) {
 			_log.debug("Sending message notifications ... site server URL= " + site.getSiteURL());