Klaviyo Sunset Flow: When to Stop Emailing Someone
A Klaviyo sunset flow is an automation that asks unengaged profiles one last time whether they want to hear from you, then suppresses the ones who do not answer. It exists because sending to people who never open is not neutral. It costs you inbox placement with the people who do.
The Number That Makes the Case
Klaviyo’s benchmark data across more than 183,000 businesses shows automated flows generating close to 41% of total email revenue from 5.3% of sends, with revenue per recipient roughly 18 times higher than campaigns and click rates of 5.58% against 1.69% Klaviyo email benchmarks, 23 January 2026.
Flow revenue is concentrated in a small, engaged population. Every profile you keep mailing that never responds dilutes the signal that gets those flows delivered in the first place.
Validity measured the consequence at network level: global inbox placement sat just below 87% in February 2024 and fell to 82.3% in the Q4 peak season, while spam placement almost doubled from 4.5% to 8.6% Validity Email Deliverability Benchmark Report.
Placement is not a fixed property of your domain. It moves with who you send to.
The Three Windows That Define Unengaged
Sunsetting fails when “unengaged” is a feeling rather than a definition. Use three windows and apply them consistently.
Ninety days without an open or click is your working engaged segment for ordinary campaigns. One hundred and eighty days is the widest audience any promotional send should ever reach, and it should be reserved for genuine launches. Twelve months without a click is the sunset trigger.
Klaviyo’s own guidance is to remove people who have not clicked in the past twelve months and to start the process at least three months before a peak season, because a domain that suddenly widens its audience in November looks to a mailbox provider exactly like a domain that bought a list Klaviyo, Black Friday email deliverability.
Two adjustments matter for ecommerce. Use click, not open, as the engagement signal because Apple Mail Privacy Protection inflates opens. And exclude recent purchasers from the sunset trigger regardless of engagement. Someone who bought silently sixty days ago is a customer, not a dead profile.
What Goes Inside the Flow
Two emails, four days apart, then suppression.
The first is a plain, short message that asks a single question and gives one button. No discount. A discount at this stage teaches your best customers that going quiet earns money.
The second says the list is being cleaned and that this is the last email unless they click. Both should be text-led and light on images, because heavy templates sent to a low-engagement audience are exactly the kind of combination filters are built to catch.
Anyone who clicks goes back into the engaged segment and out of the flow. Anyone who does not is suppressed, not deleted.
Suppression preserves the profile and its order history for reporting and for a future paid or SMS reactivation, which is where the win-back program playbook takes over.
Why This Feeds Revenue Rather Than Shrinking It
Removing twenty per cent of a list feels like removing twenty per cent of the opportunity. It is not, because that twenty per cent was already producing almost nothing while suppressing delivery for everyone else.
The measurement that matters is revenue per send before and after, not list size. Run the flow, wait two full campaign cycles, and compare.
There is a second-order benefit that shows up in the flows rather than the campaigns. The Darc Sport case study shows how the brand moved away from Mailchimp, rebuilt its retention stack with Klaviyo and Attentive, and now sees email campaign click rates consistently in the 90th percentile. Around 30% of total email revenue comes from Klaviyo automations rather than campaigns.
A 90th-percentile click rate is what a mailbox provider reads as a domain worth delivering, and it is produced by sending to fewer, better people.
If the list has never been cleaned, the sunset flow is the single highest-leverage automation you can build this quarter. We build and maintain it as part of our ecommerce email marketing service, and the surrounding flow architecture is covered in the Klaviyo flow audit playbook.
