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A segment is a set of conditions on the subscribers of a list. It copies nobody: it is worked out again every time it is used, so a subscriber joins it or leaves it on their own as their situation changes.

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Create a segment

The Segments tab of a list → New segment. Give it a name, then build the conditions. How many people match, and a glimpse of who they are, keep up as you build.
The segment builder

The segment builder: rules and a group, joined by AND / OR.

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AND, OR and groups

A segment is a group of rules joined by Match all (every rule true) or Match any (at least one true). A group may hold a subgroup with its own all/any, two levels deep:
Tag customer AND (opened Christmas offer OR clicked a link containing /order)
A segment holds 50 rules at most.

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The conditions

Only subscribers whose status is subscribed fall into a segment.

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Using a segment

  • A campaign: in its settings, Recipients → the segment instead of Everyone on the list.
  • An automation: Who may enter → the segment.
  • An RSS feed: every campaign of the feed goes to the segment.
  • The subscriber table: the Segment filter, then bulk actions or an export.
  • An export: export the segment only.
The View subscribers button on a row opens the table filtered on the segment.

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Examples

Engagement → did nothing in the last 90 days AND Subscription date → is more than 30 days ago. Send them a win-back campaign, then unsubscribe those who still do not react: your deliverability will thank you.
Attribute birth_date → is a date after the 1st of the month AND is a date before the 1st of the next one. To send on the day itself, prefer the date trigger of an automation.
Link → clicked …/order AND Tags → has none of customer.
To create segments through the API, see Segments through the API.