Before a Re-engagement Campaign, Define What “Inactive” Means

Which behavior is actually missing?

A customer bought yesterday and has not clicked an email in three months. Should they receive a message asking them to come back?

That depends on what you mean by inactive. Their email behavior and their relationship with the business tell different stories. A segment that merges those stories can produce a technically correct audience for a poorly defined campaign.

Before writing the subject line, define the behavior you want to understand, the observation window and the reason this person would find the message useful.

Name the missing behavior

Mailchimp distinguishes inactive contacts, who have received messages without recent engagement, from stale addresses that have not been mailed recently. Its guidance also notes that email inactivity does not necessarily mean inactivity with the brand. Its advice on identifying inactive subscribers depends on factors such as sending frequency and the product involved. Inactive and stale addresses, identifying inactive subscribers.

Those distinctions are useful beyond one platform. “No email clicks,” “no purchases” and “no product use” describe different observations. Give each its own name before deciding which belongs in a campaign.

A precise starting sentence could be:

This audience contains subscribed contacts with no recorded email click in the previous 90 days, after at least six eligible campaign deliveries during that window.

The numbers are invented for this example. They are not recommended thresholds. The sentence still needs decisions about exclusions, event quality and the purpose of contacting the audience.

Inspect four fictional contacts

Suppose you are planning a campaign for an online retailer. The following records are synthetic and omit personal information.

The table does not prove which contact will respond. It shows why the segment definition needs more than a date filter.

Review a small sample of records before treating a segment label as an explanation of behavior. Ask whether a colleague could reconstruct why each record belongs there.

Choose a window that matches the decision

A window creates a comparison period. It does not explain why a person became quiet.

Start with the campaign's purpose. If you want to understand response to a weekly editorial email, examine opportunities to receive and engage with that email. If you want to invite a lapsed purchaser back, use a purchase definition and a window that the business can justify.

Record the cutoff and the time zone. Decide how new subscribers, interrupted sending and recently changed preferences will be handled. Those details can change membership even when everyone agrees on “90 days.”

Also distinguish no recorded action from a known absence of action. A missing or changed event feed can create the first without establishing the second. Check the measurement before creating a behavioral explanation.

Give the campaign a reason to exist

Once the audience is clear, complete this brief:

Observed behavior: What action is missing, over which window and after what opportunity? Context: What recent activity or preference changes the interpretation? Offer: What useful reason does this audience have to engage now? Outcome: What observation would help us decide whether the campaign served that purpose?

For an editorial newsletter, an offer might be a useful issue preview or a chance to revise topic preferences. For a retailer, it might concern a relevant product category. These are possible approaches, not claims that either will improve performance.

Avoid promising that a subject line can repair a mismatch between the audience and the reason to contact it. The opening works better when it accurately reflects the relationship you have established.

Measure the purpose you wrote down

If the purpose is renewed newsletter reading, a purchase metric alone will not describe it. If the purpose is a return purchase, clicks are an intermediate observation.

Decide which result will be reviewed, over what period and against which comparison. If you need to estimate the campaign's incremental effect, design an appropriate comparison, such as a randomized holdout where practical. A before-and-after rise alone cannot isolate the message's contribution.

Keep delivery problems, complaints and opt-outs visible alongside the intended response. A campaign review should give the team enough information to decide whether to continue, revise or stop the approach.

Keep the definition beside the result

Save the audience rule with the campaign report. Include the observation window, eligible sends, exclusions and known data limitations. Otherwise a future reviewer may compare two “inactive” audiences that contain very different people.