---
title: Manage email notifications
slug: experimentation-strategy/docs/manage-email-notifications
docTags: 
createdAt: 2026-08-05T20:33:27.060Z
---

- Optimizely Feature Experimentation
- Optimizely Web Experimentation
- Optimizely Performance Edge
- Optimizely Full Stack (Legacy)

## Statistical significance and sample ratio mismatch detection notifications

To enable email notifications for when your project reaches statistical significance or Optimizely Experimentation detects a sample ratio mismatch, go to **Profile >** **Notifications** and select the corresponding projects for which you want to receive an email notification when a running experiment in that project reaches statistical significance or Optimizely detects a sample ratio mismatch.

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/dAZD09UXY-ZdDff7KW1u9-20260720-144750.png)

### Statistical significance notifications

When any of the experiment's metrics reach statistical significance, you receive an email providing enough context to help determine the urgency of any corresponding action. For example:

![example statistical significance email](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/GUuIdsGxrpQqAtjUDmVtT-20260720-144750.png)

Optimizely Experimentation polls for statistical significance differently, depending on how long the experiment has been running:

- **1-14 days** – Polls every 6 hours.
- **14-30 days** – Polls every 24 hours.
- **30-60 days** – Polls every 36 hours.
- **60-90 days** – Polls every 48 hours.
- **90-365 days** – Polls every 96 hours.
- **365+ days** – Not monitored. 

You receive a notification for the metric's statistical significance value (measured between the control and each variation) that exceeds the project's [statistical significance setting](docId\:LnxmwNc8bywfq5MG0P_3Z). Optimizely sends additional notifications for each new control and variation comparison occurrence that reaches statistical significance.

If you [reset the experiment results](docId\:mrUblIuNVOZc1dvjWdsbw) and then a metric variation reaches statistical significant (again), this registers as a first-time occurrence, and Optimizely sends an email notification.

:::hint{type="info"}
**Note**

This feature does not impact result calculations, nor does it delay the real-time processing of your results page. The default view of the results page that uses unfiltered visitor segments and date ranges determines statistical significance.
:::

### Sample ratio mismatch notifications

If Optimizely Experimentation detects a [sample ratio mismatch](docId\:JFKBHyB1tPQH0-EMRjAOR), you receive an email with the [experiment's health status](docId:2VGHBuvjNAJJnkir0LDTz) and information to review the experiment. For example: 

![example sample ratio mismatch email notification](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/H8UnJl03Vif5pC0Vs6FsP-20260720-144750.png)

Optimizely Experimentation checks for sample ratio mismatches for running experiments one time a day. This means you only receive a notification once a day.

## Impression notifications

- Optimizely Full Stack (Legacy)

To subscribe to email notifications when your impressions used exceeds 75% of the impressions included in your plan, go to **Profile >** **Notifications. **Under **Impression Usage**, select **Impression usage notifications **to enable email communications.

![enable impression usage notifications](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/_QdOBtgj8LipKGo6BPLb4-20260720-144750.png)