You Create simple utility Process with a Request Start Event that flows to a Script Activity.
In the Script Activity code the mail generator can set the standard process implementation to be adjusted like this:
import ch.ivyteam.ivy.workflow.StandardProcessType;
String projectIdentifier = "ch.ivyteam.ivy.project.wf:JsfWorkflowUi"; // use library name of your project as documented here: with the default (start) processes
ivy.wf.setStandardProcessImplementationLibrary(StandardProcessType.MAIL_NOTIFICATION_PROCESS_TYPES, projectIdentifier);
For further information see a similiar answer here:: http://answers.axonivy.com/questions/383/redirect-to-our-specific-task-list-on-task-end