Hello Sandy,

That's WordPress' default email for every new user. I don't know if you can disable it through WordPress settings, but I do know that you can do it with this plugin: https://wordpress.org/plugins/manage-notification-emails/

Just disable the option “New user notification to the user” and you’ll be good.

Oh and btw in case you wanna know where the code is, you might wanna open up this file: wp-includes/pluggable.php Line number: 1989

So when you disable this through the 3rd party plugin, your customers will only receive notifications from Amelia, without the following email:

"Username: ———

To set your password, visit the following address"

I hope that helps.