你需要在WEB-INF / lib目录中添加两个jar或者您的webapp（或服务器的lib目录）：

You need to add two jars into the WEB-INF/lib directory or your webapp (or lib directory of the server):

• mail.jar - 包含实际的smtp implmentation


• activation.jar - 需要mail.jar

• mail.jar - contains the actual smtp implmentation
• activation.jar - needed by mail.jar