Test send email

Hi all,
i try to send an email with Pentaho spoon.
i followed steps here http://wiki.pentaho.com/display/EAI/Mail_transformation

So i open a new Transformation and drop Mailm then fill all necessary fields fro sending an email with attachment.
When i launch, there is no error message and the mail is not sent.

It happens nothing.
Is there a step i forgot?

Thank you