The use of the term PayPal standard can be misleading, there are two different types of checkout that are both called standard.
If you used the checkout wizard then you are probably working with a PayPal Express Checkout implementation. This would have a similar experience for the user as they would go to PayPal when they checkout to enter their details. The difference is that with the Express Checkout option the user is returned to a pp_confirm page on your site.
With the regular Payments Standard the user goes off to PayPal and is returned to your site. Since you will not know the status of the transaction at this time you will not be going to a success page but just a thank you page. You would need to rely on the IPN page to handle the post of information back from PayPal. This system of Payments Standard is much more difficult to implement correctly and get a positive result from. I would suggest using the Express Checkout only method, it is much cleaner and will return the user to your site to complete the transaction on the pp_confirm page and based on weather or not the transaction is successful the user will go to the success or failure page.
So rite now when you checkout are you getting to the pp_confirm page? If so what happens when you try to complete the order? If the order was successful then the user should be sent to the success page where you have the Universal Email server behavior. This page should be called pp_checkout_success if you are using the Express Checkout only method.