How do tags and segments work?

Tags are simple labels you apply to contacts — “Dog-Lovers”, “Paid-Members” — to organize them by interest, topic, or anything else. Segments are dynamic groups built from tags, profile fields, and behavior, which you can pick as the audience when scheduling a newsletter. For everything else on the Audience page, see Working in Audience.

Prefer to have it done for you?

The Letterhead assistant (early access — rolling out to select accounts) can build segments and apply tags for you in conversation — for example, “build a segment of new signups” or “build a segment of everyone who opened in the last 30 days.” See how the assistant works.

Creating and applying tags

Create tags from Audience > Tags with the Create tag button — give each a name and a color. Tags can’t contain spaces; use dashes instead (e.g. VIP-Guest-List).

Apply them:

• Individually — in your Audience table, select a member, click Edit Tags, use the dropdown to search and select tags, and save.
• In bulk — on the Audience page, use the checkboxes to select individual members, or the header checkbox to select everyone on the current page (you can also check Select all to include members beyond the current page). Click + Add Tag, choose one or more existing tags — or type a new tag name to create it and include it — then click Add to apply to everyone selected. See Bulk Tag Audience Members.
• By engagement — tag readers who opened or clicked a specific newsletter straight from its metrics page.

Creating segments

Segments group subscribers based on criteria such as tags, profile fields, and engagement.

1. Go to Segments under the Audience menu and click Create segment.
2. Name the segment and choose how criteria are matched:
   • Any — subscribers match any of the criteria (OR logic), e.g. tagged Sports OR Fitness OR Gym.
   • All — subscribers must match all criteria (AND logic), e.g. tagged Sports AND custom field = Sports Enthusiast.
3. Add tag conditions — choose in (has the tag) or not in (doesn’t) — and select one or more tags.
4. Optionally add profile field or custom field conditions: pick the field, choose an operator (such as equals to, before, or after), and enter the value.
5. Optionally add engagement conditions based on when someone last opened or last clicked — see Building a segment around a rolling time window below.
6. Click Save.

Segment counts aren’t real-time — they can take up to 3 hours to update. You can still send to a segment right away; it includes the correct subscribers at the time of send.

Letterhead also builds Smart Engagement-Based Segments for you automatically, and you can chart how any saved segment engages over time against your whole-audience baseline.

Building a segment around a rolling time window

When you build a segment condition based on when someone last opened or last clicked, you can choose a rolling time window — such as everyone who opened in the last 30 days — instead of a fixed date. A rolling window keeps the segment current on its own: it always means the last 30 days relative to today, so you never have to come back and edit the date as time passes.

Where to find it: this option lives in a newsletter’s own segment builder. Open the newsletter (channel), then go to Audience > Segments > Create segment. Under Profile Fields, add a condition on Last Open Date or Last Click Date, choose an operator (is, before, after, and so on), then switch the value type from Date range to Relative days and enter the number of days.

Not seeing these options?

Engagement conditions (Last Open Date / Last Click Date) and the Relative days setting appear in a newsletter’s own segment builder. Some accounts use a newer company-level audience builder that doesn’t yet include these engagement conditions — if your Create segment panel has no Profile Fields date option, you’re on that builder. In that case, build the segment from a specific newsletter’s Segments page instead, or use the pre-built Smart Engagement-Based Segments.

A few examples of what this makes easy:

• Recently engaged — everyone who opened in the last 30 days, for a high-intent send.
• Slipping away — subscribers who last opened more than 60 days ago, for a re-engagement campaign.
• Active clickers — everyone who clicked a link in the last 90 days, to reward your most engaged readers.

If you’d rather not build the rules yourself, the pre-built Smart Engagement-Based Segments cover the common 30-, 60-, and 90-day opener, clicker, and inactive groups automatically.

Sending to a segment

When you’re ready to schedule, click Preview and schedule. In Step 2 (the Activation page), the Audience dropdown lists all your segments with their latest counts. Pick one, fill out the remaining fields, and click Activate. You can also assign a segment to a template the same way.

FAQ

What’s the difference between a tag and a segment? Tags are labels on individual subscribers. Segments are dynamic groups built from tags and other filters — e.g. tagged “Dog-Lovers” and opened last week’s newsletter.

Can I combine multiple tags in one segment? Yes — use All for tight targeting (must have every tag) or Any for broader groups (any one tag qualifies).

Does a rolling window update by itself? Yes. A rolling window is always relative to today, so a “last 30 days” segment re-evaluates as time passes without any manual edits. Note that segment counts can take up to 3 hours to refresh.

Can I delete tags or segments? Yes, if your role allows it — see Can I Delete Segments or Tags?