[GeoNetwork-users] User Self-Registration and Account Verification

I am using GeoNetwork 2.10.2, and it looks that once a user registers to create his/her account, he/she can immediately login. I'd like to let a new user to receive a verification email, from which a user clicks on a verification url link, before he/she can actually login. Is this feature available in GeoNetwork 2.10.3 or later version? Do I miss it somewhere? If a customization is required, where to start?
Thanks.
Steve