run time error: Noclass DefFound Error javax/mail/Messaging Exception. Here's more info: I use tomcat 3.2.1. The classpath is to use classes12.zip. The servlet import javax.mail.* It runs fine when the classpath set to use classes111.zip. However got above error when set tuo use classes12.zip. What things I am missing? Please give me some help here. Thanks much in advance.