...
In the sample, we define a specific topic for events to be published, and an email address is added as a subscription for that topic. In order to allow mails to be sent, we have to configure the mail sender in the client Axis2 configuration. A sample axis2.xml file for the client configuration is stored at CARBON_HOME/samples/resources/sample_axis2_client.xml. Use it to replace the CARBON_HOME/repository/conf/axis2/axis2_client.xml file. The axis2_client.xml contains an already configured mail sender section and is ready to be used.
...