XmppSimpleMessageSender is a lightweight and easy to use tool designed to help you send messages to a XMPP server.
You can send messages to either a chat room or a user. XmppSimpleMessageSender only runs in the command prompt, but it won't pose any problems to beginners. In order to use it, you have to enter the following syntax:
java -jar xmppsms.jar -mode u (or c, for sending the message to a chat room) -p password -u username -s server.com -port 1234 -targetJID firstname.lastname@example.org (or email@example.com) -message 'Softpedia!'