wc-unhook-remove-emails.php

/**
 * Unhook and remove WooCommerce default emails.
 */
function wb_unhook_those_pesky_emails( $email_class ) {

		/**
		 * Hooks for sending emails during store events.
		 */
		remove_action( 'woocommerce_low_stock_notification', array( $email_class, 'low_stock' ) );
		remove_action( 'woocommerce_no_stock_notification', array( $email_class, 'no_stock' ) );
		remove_action( 'woocommerce_product_on_backorder_notification', array( $email_class, 'backorder' ) );

		// New order emails.
		remove_action( 'woocommerce_order_status_pending_to_processing_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_pending_to_completed_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_pending_to_on-hold_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_failed_to_processing_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_failed_to_completed_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_failed_to_on-hold_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );

		// Processing order emails.
		remove_action( 'woocommerce_order_status_pending_to_processing_notification', array( $email_class->emails['WC_Email_Customer_Processing_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_pending_to_on-hold_notification', array( $email_class->emails['WC_Email_Customer_Processing_Order'], 'trigger' ) );

		// Completed order emails.
		remove_action( 'woocommerce_order_status_completed_notification', array( $email_class->emails['WC_Email_Customer_Completed_Order'], 'trigger' ) );

		// Note emails.
		remove_action( 'woocommerce_new_customer_note_notification', array( $email_class->emails['WC_Email_Customer_Note'], 'trigger' ) );
}
add_action( 'woocommerce_email', 'wb_unhook_those_pesky_emails' );