function so_39779506_filter_recipient( $recipient ) {
                
        // Use this to completely replace the recipient.
        $recipient = 'stack@gmail.com';
        // $recipient = 'siraj2544@gmail.com';
        return $recipient;
                
        // Use this instead IF you wish to ADD this email to the default recipient.
        //$recipient .= ', stack@example.com';
}
add_filter( 'woocommerce_email_recipient_new_order', 'so_39779506_filter_recipient', 10, 2 );