Smart Engagement-Based Segments

Letterhead automatically builds dynamic segments based on subscriber engagement, so you can send to your most engaged readers or re-engage inactive ones without any manual list management. Find them under Audience > Segments, labeled and marked with a lock icon.

The available segments

Each comes in 30-, 60-, and 90-day windows:

• Active Openers — opened at least one newsletter in the time frame.
• Active Clickers — clicked any newsletter link in the time frame.
• Inactive Subscribers — neither opened nor clicked in the time frame.

How they behave

• They update automatically — subscribers move in and out based on their recent engagement.
• They work like any other segment: pick one from the Audience dropdown when scheduling a newsletter, or export it from the Audience view.
• They can’t be edited or deleted — see Can I Delete Segments or Tags? If you need different rules or windows, create a custom segment instead.

Why use them

• Better targeting — send to subscribers who actually engage.
• Re-engagement — identify inactive readers for win-back campaigns, or let List Optimization manage them for you.
• Deliverability — mailing engaged readers protects your sender reputation.

You can also chart how any saved segment engages over time — opens, clicks, and click-to-open against your whole-audience baseline. See Working in Audience for the rest of the Audience toolkit.