WordPress at a glance
filter is not described

woocommerce_email_setting_columns filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_email_setting_columns', 'filter_function_name_3576' );
function filter_function_name_3576( $array ){
	// filter...

	return $array;
}
$array
-

Where the hook is called

WC_Settings_Emails::email_notification_setting()
woocommerce_email_setting_columns
woocommerce/includes/admin/settings/class-wc-settings-emails.php 278-287
$columns = apply_filters(
	'woocommerce_email_setting_columns',
	array(
		'status'     => '',
		'name'       => __( 'Email', 'woocommerce' ),
		'email_type' => __( 'Content type', 'woocommerce' ),
		'recipient'  => __( 'Recipient(s)', 'woocommerce' ),
		'actions'    => '',
	)
);

Where in WP core the hook is used WooCommerce

Usage not found.