Our plugin considers the cart as abandoned when the user adds a product to the shopping cart but leaves the website without completing the purchase. The cart is considered as abandoned as soon as the cut-off time has passed since adding the product to the cart.
For guest users, the user's email will be captured once the email address is entered in the Add to cart popup modal (if the Add to cart popup modal is enabled). If the Add to cart popup modal is disabled then the user's email and other details like first name, last name & phone number will be captured only when the guest user reaches the checkout page and enters it.