The Klaviyo Sunset Flow Mistake That Harms Deliverability
Many eCommerce brands believe an aggressive sunset flow is a sign of good list hygiene. They set up a sequence of five, seven, even ten emails to blast at anyone who hasn’t opened in 60 days. The logic seems sound: try hard to win them back, and if that fails, cut them loose quickly.
I’ve seen this pattern in dozens of Klaviyo accounts we’ve audited. It’s a mistake I made myself when I was scaling Gearbunch. The reality is this approach often does more harm than good.
Bombarding inactive subscribers doesn’t just annoy them. It actively damages your sender reputation with inbox providers like Gmail and Outlook. It tells them your emails are unwanted, which means they’re less likely to deliver your emails to the people who do want to hear from you.
A proper sunset strategy isn’t about sending more email. It’s about sending smarter emails to the right people, at the right time, and knowing when to stop.
The myth of aggressive klaviyo sunset flows
The common wisdom on sunset flows is broken. It’s built on the idea that more contact attempts will eventually lead to re-engagement. This “brute force” method feels proactive, but it ignores the underlying mechanics of email deliverability.
Your sender reputation is like a credit score for your domain. Every email you send is a data point. When people open, click, and buy, your score goes up. When your emails are ignored, marked as spam, or bounce, your score goes down.
Sending a long, aggressive series of emails to a segment of your list that has already stopped listening is a guaranteed way to lower your score. You are telling Gmail, in no uncertain terms, that a significant portion of your recipients don’t value your content. Gmail’s job is to protect its users’ inboxes from unwanted mail. It learns from your behaviour.
When we take on a new client at Elite Brands, one of the first things we look at is their sunset flow. In one recent audit for a fashion brand, we found a 7-email flow targeting anyone who hadn’t opened in 45 days. Their overall open rates were stuck at 14%. The aggressive flow was poisoning the well for their entire list.
The goal isn’t to remove subscribers as fast as possible. The goal is to maintain a healthy, engaged list and protect your ability to reach the inbox. An aggressive flow achieves neither. It churns potentially valuable customers prematurely and hurts your deliverability in the process.
Defining true unengagement in Klaviyo
Before you can fix your sunset flow, you have to fix your definition of “unengaged”. Most brands get this wrong. They use a single, simple trigger: “has not opened an email in X days”.
This is a dangerously incomplete picture.
A customer might ignore your marketing emails for 90 days but still be a loyal buyer. They might have purchased a month ago. They might have been browsing your site yesterday. Classifying them as unengaged and putting them into a suppression flow is leaving money on the table.
True unengagement is a lack of any meaningful interaction with your brand across multiple channels.
In Klaviyo, we build segments that look beyond email activity. A starting point for a truly unengaged segment might look like this: * Has not opened an email in the last 120 days * AND has not clicked an email in the last 120 days * AND has not placed an order in the last 180 days * AND has not been active on the website in the last 120 days
This multi-condition approach gives you a much more accurate view. It filters out recent buyers and active browsers, focusing only on the profiles that are genuinely dormant. The specific timeframes should match your brand’s buying cycle. A mattress brand will have a much longer cycle than a coffee subscription service.
Using overly simple definitions is a common reason brands struggle with their Klaviyo segments. They create a segment for “unengaged” users based on a 60-day open window, then wonder why their list is shrinking so fast. You need to give subscribers a reasonable chance to interact before you label them as lost causes. If you’re unsure if your current segment definitions are accurate, a Klaviyo audit covers these exact checks we run on client accounts.
Deliverability impact: the hidden cost of poor list hygiene
Sending emails to a large, unengaged list isn’t just inefficient. It’s actively harmful. The cost isn’t just the monthly fee you pay Klaviyo for those contacts. The real cost is paid in your sender reputation and deliverability.
When you repeatedly email people who don’t open, several negative signals are sent to inbox providers:
1. Your engagement rates drop. ISPs monitor open and click rates per campaign. If your overall open rate consistently dips below 20%, they take notice. Sending to a large unengaged segment drags this average down significantly, signalling your content isn’t relevant.
2. Your spam complaint rates rise. People who have mentally unsubscribed but haven’t officially opted out are more likely to hit the “spam” button. A spam complaint rate above 0.1% is a major red flag. According to Google’s own guidelines for senders, keeping this rate low is critical for deliverability.
3. Your bounce rates can increase. While Klaviyo is good at suppressing hard bounces (invalid addresses), continuing to email dormant accounts can lead to soft bounces if the inbox is full or temporarily unavailable. This is another negative signal.
We recently improved Klaviyo deliverability for a client who came to us with these exact problems. Their list was bloated with over 100,000 profiles that hadn’t opened an email in over a year. Their campaign open rates were hovering around 11%.
By implementing a proper sunset flow and suppressing 80,000 genuinely inactive profiles, their open rates for core campaigns jumped to over 25% within six weeks. Their revenue from email increased by 32% despite sending to a smaller list.
Why? Because Gmail and other ISPs saw a sudden, dramatic increase in engagement. They saw that the people receiving the emails actually wanted them. As a result, they started placing more of their emails in the primary inbox instead of the promotions tab or spam folder. A smaller, engaged list will always outperform a large, disengaged one.
Crafting a balanced re-engagement and list culling strategy
A smart sunset strategy has two parts. First, a genuine attempt to re-engage. Second, a decisive process for culling those who don’t respond. It’s about balance, not aggression.
Your goal is to win back customers where possible, but cleanly part ways when it’s clear they are no longer interested. This protects your sender reputation and focuses your resources on engaged subscribers. For our clients, we focus on a few key tactics before moving to the final sunset emails.
Multi-channel re-engagement tactics
Email is not the only way to reach a dormant subscriber. Before you assume they’re gone for good, try other channels.
We sync the “at-risk” segment from Klaviyo to Meta Ads. Then we run a targeted ad campaign with a compelling offer, like “25% Off For Your Next Order”. This reaches them in a different environment where they might be more receptive.
For subscribers who have also opted into SMS, a single, well-timed text can be effective. Something like: “Elite Brands: We’ve missed you. Here’s a 20% off code for your next purchase: WELCOMEBACK20. Expires in 48 hours.” The urgency and directness of SMS can cut through the noise of a crowded inbox.
The art of the ‘last chance’ email
When you do use email to re-engage, it can’t be more of the same. The subject line needs to be different from your usual marketing. It should signal that this email is important and out of the ordinary.
Good examples include: * “Are we breaking up?” * “A final offer before we say goodbye” * “Do you still want to hear from us?”
The content of the email must be direct. Explain that you’re cleaning your list and you don’t want to send them emails they don’t want. Provide two clear options: a large, obvious button to “Keep Me On The List” and a clear explanation that doing nothing will result in them being removed.
Combining these tactics is part of effective Klaviyo management. It turns the sunset process from a simple automated cleanup into a strategic re-engagement and list hygiene program.
Elite Brands’ recommended klaviyo sunset flow timeline
After working on dozens of eCom accounts, we’ve refined a sunset flow that works. It’s designed to protect deliverability while giving valuable customers a fair chance to re-engage. It’s based on multiple conditions, not just a lack of email opens.
Here is the framework we implement for most Shopify brands.
Trigger: A profile enters this flow when they meet all of the following criteria: * Has not opened OR clicked an email in the last 90 days. * Has not been active on the website in the last 90 days. * Has not purchased in the last 120 days.
This ensures we are only targeting truly dormant profiles.
Step 1: The Re-engagement Email (Day 1 in flow)
This is the first and only attempt at a traditional win-back. * Subject Line: “A special 20% off, just for you” or “Still interested in [Product Category]?” * Content: A strong, direct offer. This is not the time for the standard 10% discount. It needs to be compelling enough to spark action. We also remind them of the brand’s value proposition.
Step 2: The Final Notice Email (Day 15 in flow)
If they don’t engage with the first email, we send the final notice. * Subject Line: “Final notice: we’re removing you from our list” * Content: This email is transparent. We explain that we’re cleaning our list to respect their inbox. We provide one clear, primary call-to-action: a button or link that says “Yes, Keep Me Subscribed”. Clicking this link adds them to a “Manually Re-engaged” list and removes them from the sunset flow. We make it clear that if they do nothing, they will be unsubscribed.
Step 3: Suppress the Profile (Day 20 in flow)
If the profile has not opened or clicked either of the two flow emails, Klaviyo automatically applies a “Suppress” status.
We choose to suppress, not delete. Suppressing a profile keeps their data and order history in your account but prevents you from emailing them. This is crucial because it stops them from being accidentally re-added to your list later through a signup form. Deleting the profile loses all historical data.
This entire two-email process is automated. It runs quietly in the background, keeping the main list healthy. The results are consistently positive. We see improved open rates, better inbox placement, and higher revenue per recipient. You can see some of our results from implementing strategies like this.
This structured approach stops you from damaging your sender reputation and focuses your email marketing on the subscribers who are most likely to convert.
Your Klaviyo account is probably costing you more than you think
Most Shopify stores we audit have at least 5 of the same 24 revenue-killing issues in their Klaviyo setup. The free Klaviyo Audit catches them in 48 hours.
If your current sunset flow is just a long series of generic emails, it’s time for a change. A healthier list is a more profitable list.
