it will work to an extent.
first, you have to understand that paypal standard is not a real time payment processor, so any emails that you receive should not be treated as payment confirmation since the emails are sent before the user goes to the paypal site if you add it to the confirm page. adding to the confirm page, use the any form post trigger but understand that means the email is sent when the checkout page posts to the confirm page.
you should use your paypal account to verify the purchases.
with paypal standard, they use an IPN system to make notification of payment success. to send the emails on payment success, you would need to configure an IPN page. you would also need to store the order information to a database in order to retrieve the cart data on the IPN page
see the paypal IPN documentation for more details:
https://www.paypal.com/cgi-bin/webscr?cmd=p/acc/ipn-info-outside
