Personally Identifiable Information (PII) In Email: Explanation, Risks, & Protection
Security Boulevard, December 12,2025
Personally identifiable information (PII) is any data that can identify a person directly or indirectly. It includes obvious details such as names, ID numbers, and email addresses. It also includes less obvious data points like job titles, ZIP codes, and birth dates.
Email is still one of the most common places where businesses send, receive, and store PII. It is also one of the easiest places for that information to be exposed. Email was designed for open communication, and security controls were added later. That means the channel itself creates risk for organizations that handle sensitive customer or employee data.
For businesses, PII exposure in email isn't only a technical problem. When attackers harvest PII through phishing, spoofed domains, or compromised mailboxes, the company whose brand is impersonated often carries the consequences.