I tried to find a work-around for this and decided to send mails directly in a java task using javamail. I used the same code as in the web application mentioned above and I got the same exception which shows up when trying to use mail tasks. So I suppose it's a classpath issue. But which one exactly? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4260698#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...