title: check if email has been sent from fos_userBudle
body: <p>I used the great fos_userbundle for my users, I can say it work great but there is a case when I want to create my user from command that require to click the link from email for activation, sometimes the successfully message is shown but the email is not sent. So how to check if the email is sent.
  Note:
  - On my user form interface It work good.
  - I use FOSUserBundle dev-master , SF 2.8 , Ubuntu OS, and gmail account.
  thank you.</p>