Latest / The Email Marketing Podcast with Fexingo: Newsletters, Open Rates, and Subscriber Growth / How Email List Hibernation Re-Engages Dormant Subscribers
Transcript
- Lucas: So I want to talk about something that sounds almost too gentle for email marketing: list hibernation. Luna: Hibernation — like, putting subscribers on ice? Lucas: Exactly. Instead of blasting a win-back series or just purging inactive contacts, you offer them a pause. You send one email that says, 'We notice you haven't opened in a while. Would you like us to stop emailing you for 90 days? No hard feelings, we'll be here when you come back.' Luna: And they actually take you up on it? I feel like most people would just ignore that email or hit unsubscribe. Lucas: That's what I thought too, until I looked at a case study from a mid-size e-commerce retailer — about 50,000 subscribers, selling home goods with a typical purchase cycle of 4 to 6 months. They ran a traditional win-back series for a year — three emails over two weeks with a discount offer — and got about a 4 percent re-engagement rate, measured by someone clicking through and buying within 30 days. Luna: Four percent is pretty anemic. I've seen similar numbers in benchmarks. Lucas: Right. So they switched to a hibernation approach. One email, very simple, with a button that said 'Pause my emails for 90 days.' They also gave a link to update preferences for those who wanted to stay but less frequently. About 8 percent of the dormant segment clicked the pause button. Luna: So 8 percent opted into hibernation. What happened after the 90 days? Lucas: After the pause period, those subscribers were reactivated automatically — no new opt-in required, because the original permission was still valid. They just started receiving campaigns again. And over the next 90 days, 22 percent of those hibernated subscribers made a purchase. Compare that to the 4 percent from the traditional win-back. Luna: Twenty-two percent is a huge lift. But I wonder if that's partly because the 8 percent who opted in were the most engaged dormant subscribers to begin with — self-selection bias. Lucas: That's a fair point. The retailer did compare the hibernation group to a control group of dormant subscribers who were not contacted at all during that period — they just stayed in the list receiving regular campaigns. That group had a 6 percent purchase rate over the same 90 days. So the hibernation group still outperformed by a factor of more than three. Luna: Okay, that's convincing. But I've got a worry: during those 90 days, you're not emailing those people at all. If you're an e-commerce brand with tight margins, that's lost revenue opportunity from a segment that might have bought with a stronger discount. Lucas: That's the trade-off. But the retailer found that the 8 percent who chose hibernation were already not opening or clicking — their baseline revenue contribution was essentially zero. So you're not losing much, and you're avoiding the risk of annoying them into unsubscribing. Luna: True. But what about the 92 percent who didn't click pause? Did they stay on the list and remain dormant? Lucas: The retailer set a threshold: if you didn't respond to the hibernation offer, and you hadn't opened any email in the previous six months, you were moved to a suppression list — not deleted, but not mailed for another 90 days. After that, if still inactive, they'd be sunset. So it's not a free ride. Luna: That makes sense. So hibernation is really about giving the subscriber control, then using their choice as a signal. Lucas: Exactly. And the data backs it up. The retailer saw a 12 percent improvement in overall deliverability — fewer bounces, fewer spam complaints — because they weren't mailing unengaged addresses as frequently. Luna: I can see this working really well for seasonal businesses — like a garden supply store that only sells March through June. Their subscribers might not need emails in October, but they don't want to unsubscribe. Lucas: Great example. Or for any brand with a long purchase cycle — furniture, appliances, B2B services. The hibernation tells the subscriber, 'We respect your inbox, but we also want to be here when you're ready.' Luna: Where does it fail? I can imagine a scenario where hibernation just delays the inevitable — the subscriber never comes back, and you've just postponed the cleanup. Lucas: That can happen. The retailer in the study did see about 40 percent of hibernated subscribers not re-engage after the 90 days. But those people were then suppressed. So it's not a permanent hold — it's a structured test. Luna: So you're basically running a time-based experiment: give them a break, see if they come back, and if they don't, let them go. Lucas: Right. And the win is that you're not burning goodwill with aggressive win-back emails. You're also preserving your sender reputation because you're mailing fewer unengaged addresses. Luna: What about open rates? Did the hibernation group have higher open rates when they came back? Lucas: Yes — after reactivation, the first campaign to the hibernation group had a 38 percent open rate, compared to the brand's average of 22 percent. That makes sense — these people chose to be away, then chose to come back. They're more attentive. Luna: That's a strong signal. I'm starting to think this could be a better first step than a traditional win-back series, especially for brands with high-quality products that people buy infrequently. Lucas: If these marketing conversations have sparked something you've actually used — maybe you've tried a new subject line strategy or cleaned up a segment — and you've found it helpful, there's a way to keep this podcast ad-free and focused on practical stuff. It's a listener-supported show, and a lot of folks just buy us a coffee now and then. Luna: Yeah, it's a small gesture that makes a big difference — keeps us independent, no sponsor pressure. If you're ever inclined, it's buy me a coffee dot com slash fexingo. Lucas: And we really appreciate that. Now, back to hibernation — one metric I want to highlight: the optimal pause duration. The retailer tested 30, 60, and 90-day pauses. The 30-day pause had the highest opt-in rate at 12 percent, but the lowest post-return purchase rate at 14 percent. The 90-day pause had the lowest opt-in at 8 percent but the highest purchase rate at 22 percent. Luna: So longer pause leads to higher intent when they return. That makes sense — someone who says 'pause me for three months' is more committed to taking a real break, and when they come back, they're more likely to be in buying mode. Lucas: Exactly. And the 60-day group fell in the middle — 10 percent opt-in, 18 percent purchase rate. So the sweet spot seems to depend on your purchase cycle. For the home goods retailer, 90 days matched their typical gap between purchases. Luna: So you should align the pause length with your average time between orders. If your customers buy every month, a 90-day pause might be too long — they might forget you. Lucas: Right. For a monthly subscription box, a 30-day pause might be better — give them a break, then remind them why they subscribed. For a mattress company where people buy every 8 to 10 years, 90 days is nothing. Luna: I also wonder about the email copy itself. The retailer's hibernation email — what did it say exactly? Lucas: Very simple. Subject line: 'Want a break?' Body: 'We notice you haven't opened our emails lately. We don't want to clutter your inbox. Click below to pause emails for 90 days. Or, update your preferences to hear from us less often. No hard feelings either way.' That's it. No discount, no urgency. Luna: I like that it gives two options — pause or reduce frequency. That probably captures people who don't want to pause entirely but do want fewer emails. Luna: The retailer saw about 5 percent of the dormant segment click the 'reduce frequency' link. Those people ended up with a 15 percent purchase rate over the next 90 days — not as high as the hibernation group, but better than the control. Luna: So you're essentially segmenting your dormant subscribers into three buckets: those who want a break, those who want less, and those who don't respond. Each gets a different treatment. Lucas: Exactly. And that's the real power of hibernation — it's not one-size-fits-all. It's a permission-based, subscriber-driven approach to re-engagement. Luna: I'm sold on the concept for certain verticals. But I'd push back on one thing: this adds complexity. You need automation to handle the pause, reactivation, and suppression logic. A lot of small brands might not have that capability. Lucas: That's fair. Most email service providers have the tools — tags, date-based triggers, conditional logic. But it does take set-up time. For a brand with fewer than 10,000 subscribers, a simple win-back series might be fine. Hibernation pays off more at scale. Luna: What about the risk of subscribers feeling manipulated? Like, 'You paused me without asking?' But you do ask. Lucas: You ask. And you give them a clear way to say no. The email is very transparent. I think the risk is lower than sending a 'We miss you' email with a 20 percent off code that feels desperate. Luna: Fair. So let's say I'm a listener with a dormant list of 5,000 subscribers. What's the first step? Lucas: Define dormant. For most brands, it's no opens in 90 days. But you can adjust based on your send frequency. Then create a segment of dormant subscribers who have been on your list for at least six months — you want to give them a chance to engage before offering hibernation. Luna: Then send the hibernation offer email. Track the click rate. And set up a 90-day pause tag. After 90 days, remove the tag and resume normal sends. Lucas: And set a suppression rule for those who don't respond: after 90 days of no opens post-offer, move them to a sunset list. That keeps your list healthy. Luna: I think the key insight is that hibernation respects the subscriber's agency. And that builds long-term trust, even if it means fewer emails in the short term. Lucas: Yeah. It's a counterintuitive strategy, but for the right brand, it can turn a dormant list into a revenue driver without the burnout of constant win-back campaigns.