Segments

A segment is a group of subscribers you can target. Segments are the targeting layer: they define who receives a campaign, while topics define what. When you send a campaign, you pick a topic and can narrow it with a segment.

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Segment types

Segments can be Active, Inactive or Archived.

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Create a segment

In Segments, create a new segment via the Editor or Assistant chat (describe your target audience and the assistant builds the rules; see Building with the assistant):

1. Choose the type (dynamic or static).
2. Give it a name (3-200 characters) and an optional description.
3. For a dynamic segment, define at least one rule.

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Rules (dynamic segments)

Rules are conditions that automatically add matching subscribers.

• Add conditions and combine them with AND / OR logic.
• Group conditions together for more complex logic.
• Use Evaluate size to preview how many subscribers currently match before you save.

The Rules tab on a segment’s detail view lets you refine these conditions later. You can build rules on subscriber attributes and your custom fields.

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Members (static segments)

For a static segment, open the Members tab to Add members or Remove members. Search by email or name, filter by topic, and select multiple at once. Save the segment first before managing members.

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Assistant suggestions

Railmail can suggest segments for you under the Suggestions tab. Suggestions come from activity, for example post-campaign behavior or a detected pattern. Each suggestion shows a confidence level, estimated size, a rationale (“why this segment?”) and the proposed rules. You can:

• Approve: create the segment as suggested.
• Adjust: tweak it before creating.
• Dismiss: discard it.