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Posted At: Apr 01, 2026 - 602 Views

Fake Accounts and Invalid Emails on PrestaShop: How to Detect Them and Protect Your Store

You open your PrestaShop back office and find dozens of new customer accounts with random names and suspicious email addresses. Your stats show a spike in sign-ups, but your sales haven't budged. This is a well-documented, recurring problem on PrestaShop — and its consequences go far beyond a simple nuisance.

What PrestaShop says about fake accounts

According to the official PrestaShop Help Center, a large number of fake accounts on a store can slow down the site and push up its spam score. PrestaShop recommends installing a CAPTCHA module to prevent this.

The mechanism is simple: bots automatically create accounts through the registration form, entering fake or disposable email addresses. If the option to send an email after registration is enabled, PrestaShop may send an email to the new customer — including to fake or disposable addresses.

Why it's dangerous for your deliverability

Bulk sends to fake-account addresses can damage your store's sender reputation and increase the risk of your emails being filtered as spam, which may prevent some real customers from receiving your messages properly.

The concrete consequences for your store:

  • Damaged domain reputation — sending to invalid or disposable addresses signals poor list hygiene to mailbox providers
  • Skewed statistics — an artificially inflated subscriber count that distorts your open and conversion rates
  • Higher sending costs — if you sync with Brevo, Klaviyo or Mailchimp, these fake contacts inflate your billed quota
  • Polluted database — thousands of addresses with no commercial value that weigh down your exports and campaigns

Types of problematic addresses in a PrestaShop database

A poorly maintained PrestaShop database usually builds up several types of risky addresses:

  • Addresses from bot-created fake accounts — often with random names, nonexistent emails or unknown domains
  • Disposable or temporary addresses — used to create an account and grab a discount coupon, then abandoned
  • Syntactically valid but nonexistent addresses — they pass PrestaShop's format validation but trigger a hard bounce on the first send
  • Role addresses — contact@, info@, admin@ — poorly suited to marketing campaigns

At registration, PrestaShop validates the format of an email address using the isEmail method, but this check only covers syntax — not whether the mailbox actually exists, nor whether the address is disposable or risky.

How to clean your PrestaShop database in practice

1. Audit and clean existing addresses

MailHygiene PRO integrates directly into your PrestaShop back office and lets you verify and clean the emails of your customers, orders and newsletter subscribers in bulk. For each address, the tool returns a status (valid, risky, invalid), a risk score and detailed reasons — including detection of disposable domains and catch-all addresses.

2. Verify a CSV file before importing

If you export your database to clean it or import it into another tool, GTMail-Verif lets you check every address directly online — syntax, domain, whether the mailbox actually exists, disposable status — and download a clean file ready to re-import.

3. Enable a CAPTCHA on your forms

PrestaShop recommends installing a reCAPTCHA or CAPTCHA module on the registration form and the contact form to block automated fake-account creation.

4. Regularly delete suspicious accounts

Regularly review your customer list in the back office and delete accounts with random names, obviously generated email addresses or inconsistent data.

In summary

Fake accounts and invalid emails on PrestaShop aren't just a database tidiness issue — they can damage your sender reputation and increase the risk of your emails being filtered as spam.

Clean your existing database with MailHygiene PRO and check your CSV files before importing them with GTMail-Verif.

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