Normally, when we create a user in OpenERP, we need to config the out going mail first in order to send confirmation URL to the user.

To config the Out going mail, we go to Setting -> General Settings - > Configure outgoing email servers

Click on Create and
  • Description : Description something about your out going main 
  • Priority : should be put the same (10)
  • SMTP server : smtp.gmail.com
  • SMTP port : 25
  • Connecting Security : TLS (Start TLS)
  • user : sample@gmail.com
  • pass : your password
And Test mail if it is working , click save to finish.