Segments

A segment is a saved filter over a list — a living group defined by rules rather than a fixed membership. Target segments instead of whole lists to send more relevant email, lift engagement, and protect your sender reputation.

Why segment

Sending everything to everyone trains recipients to ignore you and pushes mailbox providers to filter you. Segments fix this by letting you reach only the people a message is right for. The result is higher open and click rates, fewer unsubscribes, and better deliverability over time.

How segments work

You define one or more conditions, and the segment automatically includes every contact in the list who matches. Because it's rule-based, a segment updates itself as your data changes — new contacts who match are included, and contacts who no longer match drop out, with no manual upkeep.

The segment editor: a segment with Match All logic and two conditions — email contains a company domain, and a custom Branch field equal to a specific value — each row with field, operator, and value dropdowns — Rule-based targeting — stack conditions on any field and the segment keeps itself up to date.

What you can segment on

Custom fields — location, plan, company, interests, or anything you store. See Custom fields.
Engagement — who opened or clicked recent campaigns (great for re-engagement).
Status and dates — when a contact was added, and their subscription state.
Tags — labels applied manually or by automations.

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Automations can build segments for you: tag everyone who clicks a campaign, then target the “clicked” tag in your next send.

Describe your audience (AI)

On the segment create and edit pages, the Describe your audience box turns a plain-English description into segment conditions. Type something like “Gmail users who opened an email in the last 30 days” and click Generate conditions: the AI drafts the condition rows, switches the match mode when needed, and shows a live count of matching subscribers plus a short explanation.

Nothing is saved until you save the segment yourself — the generated rows appear in the normal condition editor, where you can review, tweak, add, or remove them first. Every generated condition is validated against your list's real fields and the legal operator set; anything the AI proposes that doesn't fit is dropped and listed under the box, never saved silently. Each generation uses one AI action from your AI credits. API users can do the same via the nl-preview endpoint documented in the API resources.

Using segments

Select a segment as the recipients of a campaign, or use it to decide who enters an automation. Your plan sets how many segments you can save per list. Combine thoughtful segmentation with strong subject lines for the best results.

Segment ideas to steal

Engaged readers — opened or clicked in the last 30–90 days; your most responsive audience.
Lapsed contacts — no engagement recently; perfect for a re-engagement automation.
New subscribers — added in the last week; ideal for a welcome message.
By attribute — location, plan, or interest from your custom fields.

Frequently asked questions

Do segments update automatically? Yes. They're rule-based, so contacts join or leave a segment as their data and behavior change — no manual upkeep.

Is a segment the same as a list? No. A list is the contacts themselves; a segment is a saved filter over a list.