Disable-WooCommerce-emails.php

<?php

/**
 * Disable WooCommerce default emails.
 */
add_action( 'woocommerce_email', function ( $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' ) );
} );