mailer tag

[Carlos de Luna Saenz]

I am trying to implement the mailer taglib on the Oracle IAS 
(Apache+JServer+Tomcat)... but when  i try to use the tag a exception is 
raised with the  "java.lang.NoClassDefFoundError: javax/mail/Session"... 
any idea? i want  to send a "confirmation mail" when a JSP is reached.
Greetings
Carlos de Luna