woocommerce_email_classes filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_email_classes', 'filter_function_name_273' );
function filter_function_name_273( $emails ){
	// filter...

	return $emails;
}

$emails

-

Where the hook is called

$this->emails = apply_filters( 'woocommerce_email_classes', $this->emails );

Where in WP core the hook is used WooCommerce