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filter is not described

wpmu_signup_user_notification filter-hook . WP 3.0.0

Filters whether to bypass the email notification for new user sign-up.


add_filter( 'wpmu_signup_user_notification', 'filter_function_name_7725', 10, 4 );
function filter_function_name_7725( $user_login, $user_email, $key, $meta ){
	// filter...

	return $user_login;
User login name.
User email address.
Activation key created in wpmu_signup_user().
Signup meta data.
Default: empty array

Where the hook is called

wp-includes/ms-functions.php 1071
if ( ! apply_filters( 'wpmu_signup_user_notification', $user_login, $user_email, $key, $meta ) ) {

Where in WP core the hook is used WordPress

wp-admin/user-new.php 212
add_filter( 'wpmu_signup_user_notification', '__return_false' ); // Disable confirmation email.