Insights · stock and scarcity

The restock email, and why it is not the back in stock alert

One is an automation for the people who asked. The other is a campaign for everybody who wanted it and never said so.

An empty wire basket standing on an open laptop against a lilac ground, nothing in it
Theo Tziapouras, founder and strategy at Engage Commerce
Theo TziapourasFounder and strategy
31 August 2026 927 words5 minute read
In short · six parts

Two different sends get called the same thing. The alert goes automatically to people who registered interest, and it's close to the highest converting email any brand sends. The restock campaign goes to a much larger group who never signed up, and it's the one usually missing.

A Wilsons email designed by Engage Commerce reading it is almost gone, a boxer dog at a bowl beside the cold pressed food range, with a deadline of midnight

The alert and the campaign do different jobs

The alert is triggered, personal and small. Somebody asked to be told, so it lands the moment the stock does and it needs almost no copy. The campaign is a broadcast to a segment who never asked for anything, and it has to justify itself.

The alertThe campaign
AudiencePeople who registeredA chosen segment
TriggerStock arrivingA decision to promote it
CopyOne line and a buttonA reason to care that it's back
TimingImmediatelyOnce the alert list has had first refusal

That last row matters more than it looks. Send the campaign before the people who registered have had their go, and you've taught your customers that asking to be notified is pointless.

Four segments, in order of how well they convert

The campaign version isn't a whole-list send. Its audience is everybody whose behaviour said they wanted this and who never clicked the notify button. Which is most people.

  1. Anybody who viewed the product while it was out of stock
  2. Anybody who bought it before, if it's repeatable
  3. Anybody who bought a product it pairs with
  4. Anybody who viewed the category during the outage

Those four in sequence, across a week, will beat one send to everybody by a wide margin. And they keep the product out of the inboxes of people who never wanted it.

Say how much, and never invent a number

Scarcity works. Fabricated scarcity destroys the format. If the restock is small, say so and say when the next one's expected. If it's a full restock with no urgency in it, don't manufacture any, because customers who rushed and then watched it sit in stock for a month remember.

Where you use a countdown or a low stock indicator, it has to be reading real inventory. A timer that resets on refresh is the fastest way there is to lose a list's trust, and anybody can spot it.

What you send while it's gone decides how the restock performs

Most brands go quiet on a product while it's unavailable, then announce its return to an audience that's forgotten about it. Better pattern: one honest email during the outage explaining why. That's the thing that builds the audience for the restock.

The Wilsons cold pressed dog food range photographed together, a sample size pack in front of each

It's also the best signup opportunity you'll ever get for the alert itself, which turns a supply problem into a list of people with declared intent.

A restock is a demand signal worth acting on

Count how many people registered, how fast the stock went, and how many of the four segments converted. That's a cleaner read on demand than any forecast, and it belongs in front of whoever does your buying.

Where the same product sells out over and over, the campaign isn't the fix. Either the buying needs to change, or the product needs a waiting list run as a proper automated sequence instead of one notification.

Look at what happened last time it came back

Find the last restock and check three things. Whether the people who registered got emailed first. How long the gap was between stock arriving and the send going out. And whether anybody who viewed the product during the outage was contacted at all.

In most accounts the third answer is nobody. That's the campaign sitting unbuilt, and it's one of the first gaps we close on any account with real stock movement.

Theo Tziapouras, founder and strategy at Engage Commerce

Theo Tziapouras

Founder and strategy at Engage Commerce, the ecommerce agency for 7 and 8 figure DTC brands.

Should the restock campaign go to the whole list?

Rarely. The four behavioural segments cover almost everybody who cares, and sending to the rest puts a product they never looked at in front of them. A whole-list send only makes sense for a flagship product with wide appeal.

How soon after stock arrives should we send?

The alert goes immediately. The campaign follows once the registered list has had a few hours, which protects the value of registering. If stock is very limited, the campaign may not be worth sending at all.

Is scarcity language risky?

Only when it's invented. A real quantity, a real expected sell out or a real next delivery date is accurate and it works. Timers that reset and stock counters that don't read inventory are the versions that cause the trouble.

What should we send while a product is out of stock?

One email explaining why, with an honest expected date and a clear way to register interest. It beats silence, it builds the audience for the restock, and supply stories are usually a good deal more interesting than brands assume.

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End matter

Tell the people who asked, then tell the people who nearly did

The restock alert and the restock campaign are two different sends, and most brands only run the first. Give the registered list first refusal. Then work the four behavioural segments in order, be exact about how much stock there is, and use the outage itself as the moment to explain what happened. Done that way, a restock is a genuine event and not an inventory notification.

Theo TziapourasFounder and strategy · Engage Commerce

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