Loop New Site Notification

Hello, I need help with my multisite. I tested the signup process and I noticed that after sending the usually welcome message from my domain name, wordpress still went on to send the user two messages: one for membership signup and another for blog creation. It is supposed to be from my website only and not wordpress. Can someone tell me where to change this malfunction? I was told in the wordpress notification message to disable the option, yet I did not see where it is stated that such a meaningless function should be disabled. Please help.

Thanks in advance.
Louis.