On the Nuxeo EP built-in types, you can manage e-mailing and notifications. Before getting this features working, you need to configure your SMTP server. Nuxeo EP relies on the application server mail service for mailing stuff. So you just need to configure the mail-service.xml file in $JBOSS_HOME/server/default/deploy/. You can find examples of how to use this file in the JBoss wiki, and detailed information about the properties of this file in the JavaMail Javadoc.