PCI Compliance And Email Security
Blog post from Basis Theory
PCI DSS requires businesses handling payment cards to protect cardholder data in transit and generally prohibits transmitting unencrypted primary account numbers through email and other end-user messaging tools. Email creates exposure across sender and recipient devices, mail servers, caches, folders, and intermediary systems, potentially expanding the cardholder data environment and compliance burden. Although TLS protects some transmission links, meaningful compliance for emailed card data would require end-to-end encryption, which is difficult to deploy because both parties must use compatible encryption methods and securely manage keys. Organizations that receive unencrypted card information should use documented procedures to avoid replying with the data, remove it securely from all storage locations, notify senders of the risk, and involve IT staff. Recommended safeguards include employee training, phishing awareness, secure key handling, and technology providers that enable secure, expiring links or other alternatives, while the preferred approach is to avoid sending sensitive payment information through email altogether.
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