How do I define dormant?

Two common definitions: no email engagement in 90 days, or no product login in 120 days. Pick one based on what you can measure reliably. You can always adjust later.

Won't re-engaging dormant users hurt deliverability?

The first batch might see slightly lower inbox placement. The upside is you identify who's really dormant vs. who just needs a nudge, then you suppress the former and keep the list healthy long-term. Net: improves deliverability.

Should I include an unsubscribe link in the final email?

Prominently. The goal of the last email is a clean split: either they click and stay, or they opt out and you stop wasting sends on them. Both outcomes are wins.

What about GDPR / CAN-SPAM compliance?

Standard compliance applies. Include unsubscribe link, physical address, sender identity. After a user goes dormant >12 months without any consent refresh, you may need to re-obtain consent before emailing again, check your jurisdiction.

Can I re-engage churned paid users differently?

Yes. Different segment (cancelled_at within X months), different framing ('we built the thing you asked about'), bigger offer allowed (discounted return, extended trial).

How often should I re-run a re-engagement campaign?

Every 3–6 months is typical. Don't run it too often, you'll catch users in natural quiet periods and over-suppress.

What subject lines work best?

Honest ones. 'It's been a while' outperforms 'Don't miss out!!!' Most mailbox providers penalize urgency-driven subjects in re-engagement contexts anyway.

Can I skip the sequence and just send a 'last chance' email?

You can, and it works in a pinch. But the 3-email sequence converts ~2× more at the top of the funnel because you're giving people multiple chances to re-engage with different angles.

Use case / Re-engagement

Win back dormant users without being creepy.

Dormant users have two possible futures: they come back, or they unsubscribe. A respectful, well-timed re-engagement sequence is the difference. SegMailer handles the timing and the segmentation; you provide the copy.

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The problem

Dormant contacts drag down deliverability. Mailbox providers see lots of opens happening on your engaged list and low engagement on your dormant list, they respond by routing more mail to the promotions tab or spam. Doing nothing about dormant contacts is worse than a careful re-engagement plus clean unsubscribe.

The behavioral approach

Define dormancy behaviorally (last_opened / last_clicked / last_login thresholds). Run a three-email re-engagement with widening gaps and escalating framing. If the contact still doesn't engage, suppress them from marketing. Trust your list size less, trust your list health more.

Implementation

How to ship it, step by step.

Define dormant

Typical: no_opens_90d OR no_clicks_180d OR no_login_120d for SaaS. Store as dormant_status attribute.

Segment the dormant pool

Split into previously-engaged (high LTV worth reactivating) and never-engaged (acquisition fail, unsubscribe quickly).

Design the three-email sequence

Email 1: gentle 'we miss you' + reminder of value. Email 2: product update since they left. Email 3: 'we'll stop emailing you unless you click here.' Honest.

Suppress non-responders

After email 3, suppress contacts who haven't opened or clicked. They still exist in your database; they just don't receive marketing sends. Deliverability and list health improve.

Segment examples

Actual segment rules you can copy.

Previously engaged, now dormant

last_opened more than 90 days ago AND total_opens > 5

Never engaged

subscribed_at more than 30 days ago AND total_opens = 0

Former paid, churned

cancelled_at more than 60 days ago AND last_opened more than 30 days ago

Seasonal return window

dormant_reactivated_window_month = current_month

// If your product has seasonal peaks (tax season, conferences)

Email examples

Subject lines that actually work.

It's been a while, {{firstName}}

Gentle opening

Here's what's changed since you were last here

Product update

Final check-in: should we stop emailing?

Honest last-chance

Welcome back, here's what's new

Post-return re-orientation

What good looks like

Typical results for teams who do this well.

5–12% of dormant pool

Typical reactivation rate

Measurable within 2–3 sends

List health improvement

Often +3–8% inbox placement after cleanup

Deliverability lift

// Directional ranges, not guarantees, depends on your baseline, audience, and product.

FAQ

Re-engagement Campaigns, answered.

Two common definitions: no email engagement in 90 days, or no product login in 120 days. Pick one based on what you can measure reliably. You can always adjust later.

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