When you set up your account to send triggers to a catch-all address, the system constructs an email as it would for the customer, including the products in their cart.

The cart contents are either uploaded to a field in the Email Service Provider (ESP) system or pulled from a URL when sending and built into the email as it's being processed.

Although we trigger emails in real-time, most ESPs don't send them out immediately. Instead, they wait a few minutes and batch up the requests. This can cause issues when using a catch-all address for all the emails because the cart may have been updated several times since the first email was triggered. As a result, the same cart HTML is used when constructing the emails, either from the field or the URL.