Let's clear the tempting shortcut first: buying or scraping email lists is illegal under the GDPR, banned by every serious email tool, and (the part people underestimate) commercially useless. Cold recipients don't buy; they mark you as spam, and those complaints follow your domain around for months.

Real list growth is slower and completely worth it. Six tactics, ordered by effort.

1. Ask at checkout

Your buyers are your best subscribers. One unticked checkbox at checkout ("Email me new arrivals and offers, about twice a month") converts a meaningful share of customers into subscribers who already trust you. Pre-ticked boxes are not valid consent in the EU.

2. Offer a real incentive

"Subscribe to our newsletter" converts almost nobody. "10% off your first order" or a genuinely useful freebie (a sizing guide, a care manual, a recipe collection) converts. State what you'll send and how often right on the form.

3. A polite popup

Delayed by half a minute or triggered at exit, with an easy no. Annoying? Slightly. Effective? Consistently 2 to 4% of visitors, which compounds month after month.

4. The offline bridge

If you have a physical shop, market stall or run workshops: a QR code by the till linking to your signup page, plus one spoken sentence. Local businesses fill lists surprisingly fast this way.

5. Social to email

Followers are rented; subscribers are yours. Post the incentive from tactic 2 a few times a season. Algorithm changes have convinced enough people that email is where they'll actually see your news.

6. Double opt-in as the quality gate

Every tactic above runs through double opt-in. It trims the uncommitted before they can hurt your metrics and gives you the consent record the GDPR asks for. Slower-looking growth, but every address on the list is real.

SendMerlin ships signup forms with double opt-in, consent records and the suppression handling built in, so every one of these tactics lands on a list that stays clean.

Frequently asked questions

Can I email past customers who never explicitly subscribed?

In the EU this is the narrow soft opt-in exception: your own customers, similar products, a clear opt-out at collection and in every email. Rules differ by country, so when in doubt, ask for consent properly.

Are popups worth the annoyance?

A polite one, shown after 30 seconds or at exit rather than instantly, still converts around 2 to 4% of visitors. An instant full-screen popup converts similarly but costs goodwill; test the polite version first.

How fast should a small shop's list grow?

A healthy small-business list grows single-digit percent per month. If a tactic suddenly adds hundreds of low-quality signups, deliverability pays the bill later.