Every list has people who stopped reading. Some changed jobs or email addresses, some lost interest, and some simply get too much email. Leaving them on your list feels harmless, but it lowers your engagement, hurts your sender reputation and can increase what you pay. A re-engagement programme tries to bring them back, and politely lets go of the ones who don’t respond. This guide explains how to define “inactive” for your business, catch people before they drift away, write win-back emails that work, handle lapsed customers differently from quiet readers, and set a sunset policy.
Why inactive subscribers matter
Mailbox providers such as Gmail and Outlook decide where your email lands partly by how recipients treat it. When a large share of your list ignores you month after month, that signal works against you, and your engaged readers start finding you in spam too.
Old addresses carry another risk. Some are abandoned and eventually recycled as spam traps by mailbox providers, which can harm your reputation. And on most platforms, including contact-based plans, inactive contacts cost money every month.
This doesn’t mean you should delete everyone who hasn’t opened recently. Some quiet subscribers still buy. The point is to find out who is still interested, and stop emailing the rest.
Define inactive for your business
There is no universal number of days. It depends on how often you send and how often your customers normally buy. These ranges are starting points to adapt.
| Type of business | Typical rhythm | A sensible inactivity window to start with |
|---|---|---|
| Daily or weekly newsletter | Several emails a week | No opens or clicks in 60 to 90 days |
| Online store with frequent purchases (food, beauty, essentials) | Orders every few weeks | No engagement in 90 days, or well past their usual reorder date |
| Store with occasional purchases (furniture, electronics) | Orders once or twice a year | No engagement in 180 days |
| Event organiser | Seasonal events | No engagement since the last two events in their city |
| B2B services and software | Longer sales cycles | No engagement in 120 to 180 days, checked with sales before removing |
| Coaching and education | Admission and exam cycles | No engagement through a full admission season |
Opens are a weak signal now
Apple Mail Privacy Protection loads images automatically for many users, which records an open whether or not the person read the email. Some corporate security tools also open and click links to scan them. As a result, someone can look “active” by opens alone without ever reading.
Use stronger signals alongside opens: clicks, purchases, website visits, form submissions, replies and event registrations. A contact who hasn’t clicked in six months but bought last week is not inactive. One who “opens” every email but hasn’t clicked or bought in a year may be.
MailNesto detects machine opens and security-scanner clicks and leaves them out of open and click rates, and segments can combine engagement with orders, website visits and lead score.
Catch them before they go quiet
It is easier to keep someone than to win them back. Watch for people who are opening less than they used to, and act early with a lighter touch.
A friendly “too many emails?” message, sent when someone hasn’t opened for six or seven weeks, gives them choices: pick only the topics they care about, or pause emails for a while. A subscriber who pauses for a month during exams, a wedding or a busy work season often returns. One who unsubscribes doesn’t.
Predicted unsubscribe risk can help too. If your platform estimates who is likely to leave, send that group fewer, more relevant emails rather than the full schedule.
A three-step win-back series
- “We miss you” A warm email with your best recent content or products: what’s new since they last engaged, your bestsellers, or the most-read articles. No guilt. One clear button.
- A reason to come back About a week later, for those who didn’t respond: an incentive if it suits your business, such as a discount, free delivery or early access, or simply an invitation to update their preferences.
- “Should we stop emailing you?” A short, honest last email. Explain that you’ll stop sending unless they click to stay. People who click are tagged as reactivated; people who don’t are removed from your marketing sends.
Give each step enough time. Somebody who checks personal email only on weekends needs at least a week between emails to have a fair chance to respond.
What to put in a win-back email
- A subject line that is honest about the purpose, such as “Still want to hear from us?” or “It’s been a while, Neha”.
- A reminder of who you are and why they signed up, in a sentence. People forget.
- What has changed: new products, a new format, fewer emails, better content.
- A clear choice: stay, choose topics, pause for a while, or leave. Make each one a single click.
- A plain design that loads quickly. This audience is not looking for reasons to engage.
- No tricks. Don’t disguise a sales email as an account notice to get the open.
Lapsed customers are a different problem
A subscriber who stopped reading and a customer who stopped buying need different emails. The customer may still open everything and simply not need anything right now, or may have found another supplier.
For shops with repeat purchases, the most useful signal is each customer’s own buying rhythm. Someone who orders tea every 30 days and hasn’t ordered for 45 is late. Someone who buys a sofa every five years is not. Time your win-back to the customer, not to a fixed calendar.
A typical sequence for a lapsed customer is a “we miss you” email with products picked for them and an offer with a clear end date, followed by a last reminder before the offer expires. Those who return can be tagged and thanked; those who don’t can move into a lower-frequency segment.
Let go with a sunset policy
A sunset policy is a written rule for when you stop emailing someone. For example: “If a subscriber hasn’t opened or clicked in 180 days and doesn’t respond to our re-engagement email within a week, we unsubscribe them.” Writing it down means it happens every month, not just when deliverability is already in trouble.
Stopping doesn’t have to mean deleting. You can keep a minimal record so the address is suppressed and never mailed by accident, and the person can always sign up again. Check with your adviser how long you should keep such records under your data retention policy.
- Apply the policy automatically, so nobody has to remember.
- Exclude recent buyers and people with open sales deals, even if they don’t open emails.
- Review the numbers each quarter. If the sunset segment is growing fast, the problem may be your content or frequency, not the subscribers.
Set it up in MailNesto
- “Offer fewer emails” This recipe emails people who received your emails in the last 60 days but haven’t opened in 45, inviting them to choose topics or pause through the preference centre, where they can pause for a week, a month or three months.
- “Win back inactive” Starts when someone enters a “Not opened in 90 days” segment. It sends a “we miss you” email, tags people who come back as reactivated, sends a “should we stop emailing you?” email to the rest, and unsubscribes those who still don’t click.
- “Sunset unengaged subscribers” For contacts with no opens in 180 days: one last “do you want to stay?” email, then they are unsubscribed if they don’t open or click within a week.
- “Win back lapsed customers” Customers with no order in 90 days get a comeback offer, then a last-call reminder; those who don’t return are tagged “lapsed”.
- “Win back late customers” Uses each customer’s predicted next order date and emails them, with a coupon and products picked for them, when they are two weeks late.
Every recipe can be edited: change the days in the segment, the wording, the offer or the waits to suit your business before you activate it.
Measure the results
- Reactivation rate: the share of people in the win-back series who clicked or bought.
- Revenue from win-back emails, compared with the cost of any discount you gave.
- How reactivated contacts behave over the next three months. If most go quiet again, the incentive attracted bargain hunters rather than renewed interest.
- Bounce, complaint and unsubscribe rates on regular campaigns before and after you clean the list.
- Changes in your domain’s spam rate in Google Postmaster Tools.
Questions
Won’t removing subscribers shrink my list?
Yes, and that is the point. The people removed weren’t reading. Your remaining list engages better, which helps deliverability, and on contact-based plans you may pay less.
Should I offer a discount to win people back?
It depends on your margins and your audience. For lapsed customers, a time-limited offer can work. For newsletter readers, a better reason to read, such as a new format or fewer emails, is often enough.
How often should I run a re-engagement campaign?
Continuously, as an automation, so people enter as soon as they cross your inactivity line. That is gentler and more effective than mailing thousands of old contacts at once twice a year.
What if a sunsetted subscriber wants to come back?
They can sign up again through any of your forms. A fresh sign-up is new consent, so they rejoin your list as an active subscriber.
Should I email very old contacts I haven’t mailed for years?
Be cautious. Very old lists contain dead addresses and possible spam traps, and the people on them may not remember you. Check whether you have valid consent first, verify the list, and if you still email them, start with a small batch and a clear re-permission message.