Comment 5 for bug 621394

I found this post :
http://www.metulo.net/how-to-send-an-email-with-symfony-and-gmail

In the file factories.yml I added this "mailer:" section at the end of the "all:" section :

  mailer:
    param:
      transport:
        class: Swift_SmtpTransport
        param:
          host: smtp.myprovider.fr
          port: 25
          encryption: ~
          username: my.email
          password: ~