Accidentally Sent Sensitive Data in an Email? Here's What to Do

The Moment of Panic

You just realized the spreadsheet you attached contained employee social security numbers. Or that the email you forwarded to the client included internal salary discussions. Or that your reply included a password that was buried in the email thread. What do you do?

Immediate Steps

Act fast: If your email client has a recall or undo feature, use it immediately. Gmail’s Undo Send works within 30 seconds.
Contact the recipient: Call or message them directly. Ask them to delete the email without reading the sensitive content.
Notify your IT department: If company data is involved, your IT team needs to know immediately for compliance and damage control.
Document everything: Record what was sent, to whom, and when. This is essential for any compliance reporting.

Common Types of Data Leaks

PII (Personally Identifiable Information): Social security numbers, dates of birth, addresses, phone numbers
Financial data: Credit card numbers, bank account details, salary information
Credentials: Passwords, API keys, access tokens embedded in email threads
Confidential business data: Strategic plans, merger details, client lists, pricing strategies
Medical information: Health records, diagnosis details, insurance information

Legal Implications

Depending on the type of data exposed, you may have legal obligations:

HIPAA: Health data breaches must be reported within 60 days
CCPA: California residents must be notified of personal data breaches
GDPR: European data subjects must be notified within 72 hours
Industry regulations: Financial, legal, and healthcare sectors have additional requirements

Prevention: The Only Real Solution

Once sensitive data is in someone’s inbox, you can’t truly take it back. The only reliable solution is prevention. Mailbrake’s AI automatically scans outgoing emails for patterns that match sensitive data — social security numbers, credit card formats, passwords, and other PII — and flags them before they’re sent.

Conclusion

Data leaks via email are one of the most common security incidents in organizations of all sizes. While knowing what to do after an incident is important, preventing the leak in the first place is far better. Mailbrake’s PII detection gives you a crucial safety net.