> ## Documentation Index
> Fetch the complete documentation index at: https://docs.letterbucket.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Segments

> Group your subscribers to send targeted emails to the right people

Segments let you divide your audience into groups based on specific conditions, so you can send the right content to the right people. You can access segments from **Audience → Segments**.

<Info>
  The number of segments available depends on your plan.
</Info>

## Dynamic vs. Static segments

When creating a segment, you choose between two types:

* **Dynamic**: Membership updates automatically every night based on conditions. As subscribers meet or stop meeting the criteria, they're added or removed.
* **Static**: Membership is frozen at the moment of creation. Subscribers won't be added or removed automatically even if their behavior changes.

Use dynamic segments for ongoing targeting (e.g. "engaged readers") and static segments for one-time sends to a fixed group.

## Creating a segment

1. Go to **Audience → Segments**.
2. Click **New Segment**.
3. Enter a **name** and optionally a **description**.
4. Choose **Dynamic** or **Static**.
5. Add one or more **filter conditions**.
6. Save the segment.

LetterBucket will process the segment in the background. Once ready, you'll see the subscriber count and metrics.

## Filter conditions

Each condition is made up of a **field**, an **operator**, and a **value**. Multiple conditions are combined with AND logic — a subscriber must match all of them to be included.

**Available fields:**

| Field           | Description                                |
| --------------- | ------------------------------------------ |
| Total Opens     | Number of emails the subscriber has opened |
| Total Clicks    | Number of links the subscriber has clicked |
| Subscribed Date | When they joined your list                 |
| Unsubscribed    | Whether they've unsubscribed               |

**Available operators:**

| Operator                    | Use case                    |
| --------------------------- | --------------------------- |
| IS / IS NOT                 | Exact match or exclusion    |
| CONTAINS / DOES NOT CONTAIN | Partial string match        |
| BEGINS WITH / ENDS WITH     | Prefix or suffix match      |
| EXISTS / DOES NOT EXIST     | Field has any value or none |
| BEFORE / AFTER / BETWEEN    | Date comparisons            |

## Segment metrics

Each segment shows:

* **Total subscribers** in the segment
* **Open rate** of that group
* **Click rate** of that group
* **Unsubscribe rate** of that group

These metrics help you understand the quality of each group before targeting them.

## Using a segment

When sending or scheduling an email, open the **Audience dropdown** in the Delivery Settings step and select the segment. The summary box will show you how many subscribers will receive it.

<Tip>
  Start by sending to your most engaged segment. Higher open and click rates from your first sends help build your sender reputation before you reach the rest of your list.
</Tip>

## Exporting a segment

You can export the subscriber list of any segment as a CSV file. The export includes email address, name, and subscription status.

<Warning>
  Deleting a segment does not delete the subscribers inside it. Only the grouping is removed.
</Warning>