This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
If I understand correctly you are asking where to download javax.mail from? The package itself can be found java.sun.com - just search for it. Once you download it, put the jars in your classpath, and then you should have access to it.