Stop bad email addresses at checkout.
Stackedboost Email Guard checks the customer’s email while they are still on the checkout page, and stops disposable and mistyped addresses before the order goes through. It runs entirely on your own server.
A bad address costs you after the order, not before.
By the time you find out the email was wrong, the order is placed, the confirmation bounced and the customer cannot be reached. Most of these are not fraud, they are typos from real customers who wanted the order.
Failed deliveries
No confirmation, no tracking, no way to contact the customer when something goes wrong with the parcel.
Disputes and support
A customer who hears nothing after paying often assumes the store is fake, and the first you hear of it is a chargeback or a ticket.
List decay
Every fake address that reaches your list is a hard bounce waiting to happen, which quietly costs you deliverability on every later campaign.
What the plugin does
Everything below ships inside the free plugin and runs permanently, for every install. There is no account, no licence and no signup.
- Blocks a curated list of disposable and temp-mail domains at checkout
- Catches common typos and suggests the correct domain, so the customer can fix their own mistake
- Enforces your own custom domain blocklist
- Also validates email on account registration, not just checkout
- Works with both classic checkout and the Cart and Checkout blocks, via the Store API
- Makes no outbound requests at all. Nothing about your customers leaves your server
That last point is worth stating plainly, because most email-validation tools work by sending the address to someone else’s API. This one does not. The checks run locally against lists bundled with the plugin.
Pro adds a service on top
Pro does not switch anything on inside the plugin. It connects it to the Stackedboost API, which can do things a self-contained plugin cannot: check a list that updates continuously, query DNS in real time, and score orders after the fact.
Free
€0
- Everything listed above
- Bundled disposable domain list
- Typo detection and suggestions
- Your own custom blocklist
- Zero outbound requests
Pro
$39 / year
- The 120,000+ domain disposable list, kept current
- DNS and MX deep scan of the address
- Post-order risk scoring and order tagging
- Alerts
- Hosted dashboard
- One site per licence
Checkout is handled by Polar, which also handles VAT. You get a licence key and paste it into WooCommerce → Email Guard in your WordPress admin.
Running a Shopify store instead?
The same checkout-email engine is on the Shopify App Store under the name MailShield. Same job, built for Shopify checkout, with its own free plan.
Keep the bad addresses out of your store.
Install the free plugin from WordPress.org and it starts checking at your next checkout. Nothing leaves your server.
Get it on WordPress.org