Sending an email containing personal information, including sharing an email address↗ itself, to the incorrect recipient is considered a data breach under GDPR↗, because of the potential financial and emotional harm. Personal data is “any information relating to an identified or identifiable natural person”. It includes identifiers such as phone numbers, addresses, or online identities, as well as information unique to physical, physiological, genetic, mental, economic, cultural, or social characteristics.
How Is Confidential Info Sent to the Wrong Email Address?
When a person needs to send several emails or is too exhausted to pay attention to detail, they might end up sending emails to the incorrect address. It's not uncommon for people to rely on the autofill function of the recipient field. If the email address isn't double-checked, it could lead to a misdirected email. A recipient's email address can also be mistyped. Generally, once an email is sent, it's impossible to redact. However, some email providers like Gmail have an option to undo an email just a few seconds (between 10 to 30 seconds) after it's sent. Meanwhile, Outlook provides the option to recall an email. However, it doesn’t guarantee that the email hasn't already been read and usually applies within your organization only.
Ensuring Lawful Data Processing & Sharing
There are exceptions where data processing and sharing are lawful and GDPR compliant↗. These include the following:
- Consent: If you've already provided legitimate consent, then it doesn't have to be asked for again.
- Contract: If you've signed a contract with a body, it can contain clauses that allow the body to use your personal data in the stipulated ways.
- Vital Interests: Your personal data can be used in cases where it concerns your or someone else's life.
- Legitimate Interests: Bodies can use your personal data for legitimate business interests that are considered reasonable and low risk.
- Public Tasks: Bodies can use your personal data for processes such as calculating tax or paying state support.
- Legal Obligation: There are certain laws that require a body (e.g. your employer) to process your personal data.
If in doubt, the Information Commissioner's Office has an assessment tool↗ that can provide guidance on whether a breach has occurred. If so, employees should inform their company's data security experts. An attempt must be made to recall the email. Alternatively, the incorrect recipient must be contacted and requested to delete the email.
Conclusion
An email breach can potentially cause significant damage to your company's reputation and the safety of the email’s owner. In addition, the penalties for breaching the GDPR are drastic. Therefore, organizations cannot afford to ignore them.
What Counts as a Data Breach in Your eCommerce Workflow
For eCommerce brands using Shopify, BigCommerce, or Klaviyo, accidental email misroutes happen constantly. Sending a customer invoice with their full address to a wrong email. Exporting order data to a team member's personal account instead of the business one. Forwarding a DSAR (data subject access request) response to the wrong person on your team.
The key question: does it have to be a stranger's email to be a breach? No. Under GDPR, even sending customer PII to someone within your own organization who shouldn't have access counts as unauthorized disclosure. If your support agent accidentally CCs a manager on a customer complaint email that contains payment history or health information, that's a breach you need to report.
Your eCommerce team handles sensitive data daily—payment info, shipping addresses, phone numbers, purchase history tied to identifiable people. The moment that data lands in an unauthorized inbox, GDPR considers it breached, regardless of whether it was a typo or a moment of distraction. This means you can't simply assume "it was an accident, so it doesn't count." The regulation doesn't distinguish between intentional and unintentional disclosure when assessing whether harm occurred.
The real risk for your brand: if the unintended recipient is a competitor, a disgruntled employee, or someone outside your company entirely, customer data is now in the wild. Your customers may have a valid claim against you, and you'll face notification obligations within 72 hours of discovery.
Preventing Wrong-Email Mishaps in Your Operations
Your team needs systems, not just good intentions. Start with email templates. If you're sending sensitive data via email (which you should minimize), use pre-populated templates with the correct recipient fields locked in. In Klaviyo, for example, you can set up automation rules so transactional emails containing order data always route through verified addresses, not free-form fields your team types into manually.
Second, implement a "send delay" practice. Most email platforms—Gmail, Outlook, even Klaviyo's email features—allow you to delay sending by 5–30 seconds. Train your team to always pause and verify the recipient before that window closes. This costs nothing and catches the majority of misdirected emails.
Third, audit your team's access levels. Does every customer service rep need the ability to send emails containing full customer records? Probably not. Limit who can export customer data, who can access payment information in your eCommerce platform, and who can send customer-facing emails outside your CMS. Most Shopify apps and email platforms allow role-based access controls—use them.
Finally, document your email protocols in writing. Make it part of your onboarding. A simple checklist—"Is the recipient correct? Is this the right data to send? Do I have a business reason to share this?"—prevents costly mistakes and shows regulators you're taking data protection seriously.
Notification Requirements When a Breach Happens
If a wrong-email breach occurs at your eCommerce brand, you have specific legal timelines. You must notify your Data Protection Authority (in the EU, this is usually your country's DPA; in the UK, it's the ICO) within 72 hours of discovering the breach. This isn't optional.
You also need to notify affected customers "without undue delay" if there's a high risk of harm to them. High risk typically means the data was financial, health-related, or could lead to identity theft. For eCommerce, this includes payment card information, full names with addresses, or email addresses linked to account passwords.
Your notification must explain what data was involved, how many people were affected, and what steps you're taking to prevent it happening again. If you delayed discovery (say, you didn't notice the wrong email for days), document why and be honest about it.
Keep records of everything: when you discovered the breach, what emails you sent, who you contacted, what the recipient said. This demonstrates good faith and compliance. If you later face a customer complaint or regulatory investigation, this paper trail is your defense.
Recovery: What to Do Right Now
If your team just misdirected an email with customer data, here's your action plan. First, immediately contact the unintended recipient. Ask them to confirm receipt, delete the email, and not forward it further. Be direct: "You received this email in error. It contains confidential customer information. Please delete it immediately and confirm deletion."
Document their response. If they refuse or don't reply within a reasonable timeframe (24 hours), escalate internally to your legal or compliance team—you may need to involve law enforcement or your DPA.
Second, notify your affected customers as soon as you know a breach occurred. Transparency prevents bigger problems later. Your message should be brief: acknowledge the mistake, describe what data was involved, confirm what you're doing to fix it, and offer a contact person for questions.
Third, review how the breach happened. Was it autofill? Was the recipient field not checked? Did your systems allow too many people to access the data? Use the incident to patch your process. This shows regulators you're not just reacting—you're improving.