private void stopOfflineFlooding(JID senderJID) {
        LocalClientSession session = (LocalClientSession) sessionManager.getSession(senderJID);
        if (session != null) {
            session.setOfflineFloodStopped(true);
        }
    }
Implements JEP-0013: Flexible Offline Message Retrieval. Allows users to request number of
messages, request message headers, retrieve specific messages, remove specific messages,
retrieve all messages and remove all messages.

@author Gaston Dombiak
xmppserver/src/main/java/org/jivesoftware/openfire/handler/IQOfflineMessagesHandler.java