Playbook · Ecommerce
How to grow an ecommerce email list
Email is the channel you own outright. Growing the list properly matters more than any single campaign you send it.
- 7 ranked moves
- 4-week sequence
- Under £100 a month
How to grow an ecommerce email list: what should you actually do?
Email is the channel you own outright. Growing the list properly matters more than any single campaign you send it. There are 7 ranked plays here, starting with time the popup to intent, not page load, sequenced over 4 weeks, each with the tools it needs, the hours it takes and what it costs. Written for 2026 and free to read in full.
Last updated 3 August 2026
| Play | Effort | Cost |
|---|---|---|
| Time the popup to intent, not page load | 1 hour | £0–£20 a month |
| Test incentives beyond the default 10% off | 2 hours | £0 |
| Capture SMS alongside email at checkout | 1 hour | £20–£50 a month |
| Add a second capture point beyond the homepage popup | 2 hours | £0 |
| Run a giveaway with a genuinely relevant prize | 1 day setup | Cost of prize product |
| Clean the list regularly to protect deliverability | 2 hours a quarter | £0 |
| Collect email at physical touchpoints too, if you have any | 2 hours | £0–£20 for printing |
An ecommerce email list is the one channel where you're not renting attention from an algorithm — every subscriber is reachable directly, for free, indefinitely. Most stores under-invest in list growth relative to how much they invest in campaigns to send to it, which caps the ceiling of everything else in their marketing.
This plan is for a store with basic email marketing already running (a welcome flow, some campaigns) that wants to grow the list itself faster, without resorting to popups so aggressive they hurt conversion.
- — A store with email marketing software already connected
- — Under 5,000 email subscribers, or a plateaued list
- — Reasonable traffic already (500+ visits a month) to capture from
- — Willingness to test incentive types rather than defaulting to 10% off
If your list is over 20,000 and growth has plateaued specifically due to list fatigue or poor deliverability, this plan is too basic — you need a re-engagement and sunset strategy first.
The moves
Ranked, highest return first.
Work down the list. Each one names the first step so there's nothing to plan.
- 01
Time the popup to intent, not page load
A popup that fires the instant someone lands annoys visitors before they've seen anything worth signing up for, and hurts both signup rate and bounce rate.
First step: Set the popup to trigger on exit intent on desktop, and after 30–40% scroll depth or 15 seconds on mobile, rather than immediately on load.
- Tools
- Klaviyo, Privy, or Shopify Forms
- Effort
- 1 hour
- Cost
- £0–£20 a month
- 02
Test incentives beyond the default 10% off
A discount trains new subscribers to expect one on every future email, but a genuinely useful incentive (a guide, early access, a free small item) can convert just as well without that side effect.
First step: Run two popup variants for a month: your usual 10% off against a non-discount incentive relevant to your product (a sizing guide, styling tips, early access to drops).
- Tools
- Klaviyo A/B testing on forms
- Effort
- 2 hours
- Cost
- £0
- 03
Capture SMS alongside email at checkout
SMS opt-in rates are strong at the checkout step specifically, when someone's already committed to buying, and it's a channel most competitors under-use.
First step: Add an SMS opt-in checkbox at checkout with a clear one-line reason ('order updates and occasional offers'), pre-unchecked to stay compliant.
- Tools
- Shopify checkout, Postscript or Klaviyo SMS
- Effort
- 1 hour
- Cost
- £20–£50 a month
- 04
Add a second capture point beyond the homepage popup
Relying only on a homepage popup misses people who land directly on a product page or blog post and never see it, or who dismissed it once already.
First step: Add a footer signup form and an inline capture block within your top blog posts or content pages, separate from the popup.
- Tools
- Your store theme, Klaviyo embedded forms
- Effort
- 2 hours
- Cost
- £0
- 05
Run a giveaway with a genuinely relevant prize
A giveaway can add subscribers fast, but only produces useful subscribers if the prize is your own product (or closely related), not a generic prize like cash or an iPad that attracts non-buyers.
First step: Run a giveaway of your own bestselling product bundle, requiring email signup to enter, promoted through your existing social channels for two weeks.
- Tools
- KingSumo, Gleam, or a simple form
- Effort
- 1 day setup
- Cost
- Cost of prize product
- 06
Clean the list regularly to protect deliverability
A list full of unengaged addresses drags down open rates and can get your domain flagged, which hurts every email you send, including to your best subscribers.
First step: Every quarter, suppress or run a re-engagement campaign for anyone who hasn't opened an email in 90+ days before removing them from regular sends.
- Tools
- Klaviyo suppression lists
- Effort
- 2 hours a quarter
- Cost
- £0
- 07
Collect email at physical touchpoints too, if you have any
In-person events, markets or packaging inserts reach people who may never encounter your site's popup at all.
First step: Add a QR code on packaging inserts and any physical event material linking straight to a simple signup page with an incentive.
- Tools
- QR code generator, landing page
- Effort
- 2 hours
- Cost
- £0–£20 for printing
Sequence
What to do first, week by week.
Fix the popup
Retime the popup trigger, and set up an A/B test between a discount and a non-discount incentive.
More capture points
Add footer and inline capture forms, and the SMS opt-in at checkout.
Push for volume
Launch the product giveaway across your existing social channels.
Protect the list
Run the quarterly re-engagement/suppression pass and add the QR code to packaging if relevant.
Avoid
Where this usually goes wrong.
Firing the popup on page load every time
It's the single most common cause of a low signup rate — give visitors a moment to see the site before asking for their email.
Always defaulting to a 10% discount incentive
It trains subscribers to expect a discount in every email and can attract deal-seekers who never buy at full price. Test alternatives.
Never cleaning the list
A large but unengaged list hurts deliverability for everyone on it, including your most valuable, active subscribers — quarterly cleanup is not optional at scale.
Questions
Common questions.
What's a good popup conversion rate?
2–5% of visitors signing up is typical for a well-timed popup with a decent incentive; below 1% suggests the timing or offer needs work.
Should I always offer a discount to grow the list?
No — test it against a non-discount incentive relevant to your product. Discounts convert well but can attract subscribers who only ever buy on sale.
Is SMS worth collecting alongside email?
Yes, particularly at checkout where opt-in rates are highest, but keep sends to 2–3 a month to avoid opt-outs.
How often should I clean my email list?
Quarterly is a reasonable cadence — run a re-engagement campaign for 90-day-plus unopeners before suppressing or removing them.
Do giveaways attract low-quality subscribers?
Only if the prize isn't relevant to your product — a generic prize like cash draws people who don't care about buying, while your own product as the prize filters for real interest.
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