Recently I found out that my customers did not receive the automatic confirmation email from my store after they place the order and made payment through Paypal. I need to manually send the confirmation email to customer by clicking the button "send email" in sales>order>order view. The order status also keep remaining in "pending" even though the customer has completed their payment in Paypal.
I would like to know how this can be fixed and also if it is a setting problem or coding problem. I am using Magento ver. 18.104.22.168 now.