# Setup

To enable the notifications, you have to go to `Extensions > My Extensions > Apps` in the admin. and then at the app "Back in stock notification" right click on `... > Configuration` on the right.

Now you are in the settings for the app. You now have to perform the following two steps:

* First, you have to activate the app for your sales channels via the checkbox `Activate`.
* In addition, you have to enter your SMTP access data for email communication under `Mailer`. Make sure in any case that `Host`, `Username` and `Sender address` are filled in, as these are mandatory fields. Most likely you will also need to fill in the `Port`, `Password` and `Encryption` fields.

Finally, you need to press the `Save` button. That was all!

![](https://1923190518-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MhDVIwCi_IMhrBtbXDD%2F-MhSnrW7I5aYypVOXL7B%2F-MhSnxw1PST-lkRgYYUW%2Fimage.png?alt=media\&token=93056845-357a-440e-acb1-93181451aa4a)

{% hint style="warning" %}
**Attention**

The entry of the email addresses in the product detail pages is only visible if the associated product is not available. Usually this means that the `Stock` is set to `0` and the `Clearance sale` is set to `on`. However, this can differ slightly per store, as other extensions can also have an influence on the availability.
{% endhint %}

{% hint style="info" %}
**Tip**

Emails to customers are only sent when a product that was previously unavailable (e.g. due to lack of stock), now becomes available again. It is exactly at this transition that the delivery happens.
{% endhint %}