Add more email adresses to get notifications, remove default address

I don’t know php, but after looking at other posts, your files on gist and searching through the source code for a filter I put this together:

// send new registration notifications to additional email addresses
function additional_registration_notifications( $to ) {
	$to = 'CUSTOM EMAIL ADDRESSES';
	return $to;
}
// add new email address to the notification list
add_filter( 'new_user_approve_email_admins', 'additional_registration_notifications' );

But I get an error when I use this?

EDIT: the error after the registration form is submitted – Warning: array_unique() [function.array-unique]: The argument should be an array in…

I had the same problem. You were close, I had our web consultant look at it and found the following code to work. You will need to put this in the functions.php file.

// send new registration notifications to additional email addresses
function additional_registration_notifications( $to ) {
   $to = array('email-1', 'email-2', 'email-3',...);
   return $to;
}
add_filter( 'new_user_approve_email_admins', 'additional_registration_notifications' );

Hope this helps.

Awesome, that seems to be working perfectly, and it overrides the default.

Thanks!