BuddyPress.org

Hello,
I recently passed to buddypress with youzer plugin but i have a problem about subscribe notification.
For each member, i receive 2 messages notification for tell me a new member signup to my site.
But it’s really annoying when u have more than 100-150 subscription per day because u receive more than 300 messages ..

I want to know where i can disable the signup notification mail ?

Thanks u.