Should Shopify merchants suppress recent buyers from promotional email and SMS?

A customer buys from your store in the morning.

That afternoon, they get an email saying, “Don’t miss out.” Then an SMS with the same offer arrives the next day.

Nothing is technically broken. The campaign was sent to a list. The customer was on that list. But the message no longer fits where they are.

For most promotional campaigns, you should suppress recent buyers. That means excluding people who placed an order recently from the same offer, campaign, or campaign sequence.

The important part is same offer. This is not a rule that says recent buyers should hear nothing from you. They may still need an order confirmation, shipping update, welcome message, product education, or a different campaign that is genuinely useful to them.

Start with the campaign, not a permanent rule

A broad rule like “exclude everyone who bought in the last month” can be too blunt.

Say your store sells coffee. Someone buys a bag of beans today. They probably do not need a reminder about the exact offer they just used. But you may still want to send them an email about a brewing guide, a subscription option, or a new product that is not part of that promotion.

Instead, ask a narrower question before each promotion:

• Would this message feel wrong if the customer bought this offer yesterday?
• Is the campaign trying to drive the order they have already placed?
• Does the sequence include more than one message?
• Are email and SMS both part of it?

If the answer is yes, exclude recent purchasers from that campaign.

Klaviyo’s current guidance is a useful starting point: create a recent purchasers segment for people who placed an order at least once in the last three days, then exclude that segment from email, SMS, or push campaigns. It also notes that you can use a different window, such as 24 hours or 10 days.

Three days is not a law. It is a setting you should choose for the campaign in front of you.

Pick a window that matches what you are sending

The right suppression window depends on the offer and the buying cycle.

A short sale may need a short window. If a customer buys during a one-day promotion, excluding them for 24 hours may cover the remaining sends.

A campaign that runs for a week may need a longer window. If your messages continue for several days, a three-day exclusion may not be enough on its own.

A longer window can also make sense when the same product is not normally bought again soon. But do not turn that into a permanent default without thinking through the message.

Here is a simple way to decide:

• One-off promotion: Exclude people who purchased recently, often for the rest of the promotion.
• Multi-day sequence: Remove people as soon as they purchase, so they do not receive later messages.
• Product-specific offer: Exclude people who bought the promoted product or offer, where your data supports that distinction.
• Store-wide sale: Exclude recent purchasers if the next message is still asking them to make the purchase they already made.

Your first version does not need perfect logic. A recent purchasers segment is a sensible baseline. You can refine it once you see where the campaign and catalogue call for more detail.

Scheduled campaigns need a send-time check

There is an easy gap in this setup.

You schedule a campaign on Monday for Thursday. A customer receives an earlier message and buys on Tuesday. If your audience was fixed when you scheduled the campaign, they may still get Thursday’s reminder.

For scheduled campaigns, calculate exclusions at send time.

Klaviyo specifically recommends enabling “Determine recipients at send time” for a future campaign. That lets the platform check who qualifies when the campaign actually goes out, including people who placed an order after you scheduled it.

The same principle applies in Sentira: your audience should be evaluated against the latest customer activity when the campaign sends, not only when someone first builds the campaign.

This is where a unified customer profile matters. The profile needs the order event alongside email and SMS consent, campaign history, and segment membership. If an order arrives after the campaign is scheduled, the customer’s profile should no longer meet the promotion’s audience rules.

Before scheduling your next promotion, take one minute to check this:

• Open the recipient or audience settings.
• Find the exclusion segment.
• Confirm it includes recent purchasers.
• Check whether the audience is calculated at send time.

If you cannot tell when the audience is checked, run a small internal test before using the campaign for customers.

A flow needs an exit, not just an entry rule

Campaigns are sent at a point in time. Flows run over time.

That difference matters.

Say you run a three-message promotion. A customer receives the first email, buys, then is still queued for an SMS and another email. An exclusion added only when the flow starts will not always solve that problem.

The flow needs a way to stop when the customer converts.

Klaviyo’s omnichannel exit criteria can use Placed Order as the conversion event. When a customer buys after the first message, they are excluded from the remaining messages, including later email and SMS sends. Klaviyo says this setting is off by default.

In Sentira, build this into the flow logic from the start: if the goal of the sequence is an order, an order should remove the customer from the rest of that sequence.

That gives you one rule across channels. The customer should not get a follow-up SMS just because their purchase happened after the email branch was sent.

When reviewing a flow, look for these two separate controls:

• Entry conditions: Who can enter the flow?
• Exit conditions: What event removes someone after they enter?

Both are needed. Entry conditions prevent poor fits at the start. Exit conditions catch the customer whose situation changes halfway through.

Treat abandoned checkout as a separate check

Abandoned checkout is the common place where this goes wrong.

A customer can start checkout, leave, and trigger your flow. Then they may return and complete the order before the next reminder goes out.

Do not assume Shopify’s abandoned-checkout status alone will prevent the later message.

Klaviyo recommends adding a filter such as “has placed order zero times since starting this flow.” In plain terms: before each reminder, check whether the person has bought since they entered the flow. If they have, do not send the reminder.

This is a useful pattern beyond abandoned checkout. Any flow that asks for a purchase should check whether the purchase has already happened.

Set up one clear recent-buyer segment

For a practical starting point in Sentira, create a segment based on an order event:

• Condition: Placed Order at least once.
• Period: In the last three days.
• Use it in: Promotional email and SMS campaign exclusions.

Then add order-based exit rules to promotional flows.

You can change the period later. The first goal is simpler: stop sending people a message that assumes they have not bought when they have.

Do not suppress recent buyers from every message by default. Suppress them from messages made obsolete by their purchase. That is the useful distinction.

Sources

• Klaviyo: Exclude recent purchasers from a campaign
• Klaviyo: Omnichannel flow exit criteria
• Klaviyo: Abandoned cart flow guidance
• Klaviyo: Abandoned checkout guidance

The next time you schedule a promotion, open its exclusions and ask one question: if someone buys before this sends, will they still receive it?