> For the complete documentation index, see [llms.txt](https://preorder-notify.tech-arms.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://preorder-notify.tech-arms.io/faq/back-in-stock/when-email-sent.md).

# When exactly is the restock email sent?

The restock email is sent automatically when **both** conditions are met at the same time.

***

### Trigger conditions

| Condition                         | Details                                                                                  |
| --------------------------------- | ---------------------------------------------------------------------------------------- |
| **Inventory goes above 0**        | A subscribed product/variant's stock is updated from 0 to any positive number in Shopify |
| **Email notification is enabled** | The toggle **Send email automatically** in **Back in Stock → Config → Email** tab is ON  |

**Both must be true simultaneously.** If the toggle is off when stock is updated, no email will be sent — even after you enable it later.

***

### What triggers an inventory update?

The restock email fires when inventory increases via any of these methods:

* Manual update in **Shopify Admin → Products → Inventory**
* Receiving a **Purchase Order** in Shopify
* Third-party **inventory sync apps** (e.g. Stocky, inventory management tools)
* **Shopify POS** receiving stock at a location
* Import via **CSV** with updated quantities

***

### Important notes

{% hint style="warning" %}
**Email is sent per-variant.** If a customer subscribed to "Blue / Size M" and you restock "Blue / Size L", they will NOT receive an email.
{% endhint %}

{% hint style="info" %}
Subscribers in the **Current waitlist** tab (status: **Pending**) will be notified. Subscribers already in the **Notification sent** tab (status: **Sent**) will not receive the email again unless you use **Resend email**.
{% endhint %}

***

### If the email was not sent

Check the following:

1. Was **Send email automatically** enabled at the time of the restock?
2. Was the product/variant within your **Product Scope**?
3. Was the subscriber still in the **Current waitlist** tab (status: Pending)?

→ [Email Notification settings](/back-in-stock/email-notification.md)