woocommerce_email_setting_column_(key) action-hook . WC 1.0

Usage

add_action( 'woocommerce_email_setting_column_(key)', 'action_function_name_2324' );
function action_function_name_2324( $email ){
	// action...
}

$email

-

Where the hook is called

do_action( 'woocommerce_email_setting_column_' . $key, $email );

Where in WP core the hook is used WooCommerce