WordPress at a glance
filter is not described

send_site_admin_email_change_email filter-hook . WP 4.9.0

Filters whether to send the site admin email change notification email.

Usage

add_filter( 'send_site_admin_email_change_email', 'filter_function_name_3728', 10, 3 );
function filter_function_name_3728( $send, $old_email, $new_email ){
	// filter...

	return $send;
}
$send(true/false)
Whether to send the email notification.
$old_email(string)
The old site admin email address.
$new_email(string)
The new site admin email address.

Where the hook is called

wp_site_admin_email_change_notification()
wp-includes/functions.php 5842
$send = apply_filters( 'send_site_admin_email_change_email', $send, $old_email, $new_email );

Where the hook is used (in WP core)

Does not used.