Disposable email services hand out an unlimited supply of fresh, working inboxes. For a store running a welcome discount, free-shipping threshold, or referral bonus, that is an open door: the same person signs up again and again under a new throwaway address every time, and your margin walks out with them. Checkout Defense closes that door.
What it watches for
Checkout Defense checks the email on each order and signup against a maintained list of disposable and throwaway domains, plus pattern signals that mark an address as high-risk. When it sees one, it can block the checkout outright or quietly tag the order so your team can review it before fulfillment — your choice, per the rule you set.
- Disposable-domain detection — catches mailinator-style throwaway inboxes used to farm one-time promos.
- Risky-signup tagging — flags suspicious accounts so you can hold or review instead of shipping blind.
- Promo-abuse defense — stops the same shopper from claiming a first-order code under endless fake addresses.
- Fewer chargebacks — screening out fake orders at the door means fewer disputes to fight later.
Why screen at checkout, not after
Once a fraudulent order is paid and shipped, you are reacting — refunding, disputing, eating the loss. Screening the email at the moment of checkout moves the decision to before the money and the goods move, where it is cheap to act on. Checkout Defense puts that check inline so the abusive order never becomes a problem you have to clean up.
Who Checkout Defense is for
Any Shopify store that runs discounts, free trials, referral bonuses, or first-order incentives — exactly the offers that throwaway emails exist to exploit. It pairs naturally with the rest of the toolkit: brands already proving quality with COA Vault or labeling with FactsPanel use Checkout Defense to make sure the promotions driving traffic actually reach real buyers.
Honest about what it is
Checkout Defense is a risk-screening aid. It evaluates email addresses against known disposable domains and risk signals and applies the rule you configure — it does not guarantee that every fraudulent order is caught or that a blocked address is always abusive. You stay in control of the block-versus-tag policy and any manual review.