how to use:

find the following code in offlinemsg\src\java\org\jivesoftware\openfire\plugin\OfflineMsg.java

                	/*
                	 * add your code here to send offline msg
                	 * recipient.getNode() : receive's id,for example,if  receive's jid is "23@localhost", receive's id is "23"
                	 * content: message content
                	 */

add your code for send offline msg, usually is the queue to send msg