sfAction->sendEmail($module, $action)

The ->sendEmail() method of the sfAction class is a special kind of ->forward() that executes another action but comes back afterward (it doesn't stop the execution of the current action). In addition, it returns a raw email that can be written into a log file (you will find more information about the way to log information in the debug chapter of the symfony book).

http://www.symfony-project.com/book/trunk/email