How can you customize the reason why the email was sent in the footer?

So, by default, the footer line will say:

This email was sent to you because you placed an order at www.example.com. You can _unsubscribe_ from these emails.

Sometimes certain email triggers are sent for different reasons and this line needs to be customized. The abandoned cart is a great example of that:

The simplest option is to modify the "placed an order" part of the sentence using the *Why email is sent* field. Another option if you need to replace the entire first sentence is to use the *Why email is sent (full)* field.