If customers are signing up but not receiving their restock emails, here’s how to investigate and fix the issue.
1. Check the Delivery Log
Go to Deliveries in the app. Find the notification in question and look at its status:
Bounced — the email couldn’t be delivered. See the reason shown and check the steps below.
Failed — something prevented the email from sending. The reason is shown next to the entry.
Sent but no Delivered status — the email left the system but hasn’t been confirmed as received. This can take a few minutes; if it persists after an hour, the email may have been silently rejected.
2. Check the Customer’s Email Address
The most common cause of failed delivery is an incorrect email address. The customer may have made a typo when signing up.
Open the Alert Requests list and find the customer’s signup.
Click Edit and correct the email address.
The next time that product restocks, the corrected address will be used.
3. Check the Product Was Actually Restocked in Shopify
The app only sends notifications when inventory updates in Shopify.
Go to the product in Shopify and confirm the inventory was increased for the correct variant.
Make sure the variant is not set to “Continue selling when out of stock” — if it is, the app won’t treat it as a restock event.
4. Ask the Customer to Check Their Spam Folder
Restock emails can occasionally end up in spam, especially if the customer’s email provider is strict. Ask them to:
Check their Spam or Junk folder.
Search for the email by subject line or your store name.
Add your store’s sending address to their contacts to prevent future emails going to spam.
5. Check the Request Was in Active Status
Only requests with Active status receive notifications. If a customer’s request was Pending (unverified) at the time of the restock, they won’t have been notified. They’ll need to re-sign up and confirm their email address first.