I am learing Javamail. I set my CLASSPATH to include the "mail.jar" file obtained from the download, as well as the current directory. Also included the "activation.jar" file obtained from downloading the Java Activation Framework, in my CLASSPATH.I compiled one of the demo programs. When i tried to run it, i got "Exception in thread "main" java.lang.NoClassDefFoundError: mesgsendsample".Please give me a solution to successfully send an email using javamail.