PCI DSS requires you to detail the measures you have taken to ensure cardholder data is protected in transit. Email communication of cardholder data is considered part of the Cardholder Data Environment.
Most organizations rely heavily on emails for their daily business communication, but email remains one of the most common vectors businesses are attacked. This is why it is essential to implement email security best practices.
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PCI DSS GUIDE's aim is to clarify the process of PCI DSS compliance as well as to provide some common sense for that process and to help people preserve their security while they move through their compliance processes.
The industry practice is to eliminate the middle six digits, but the standards for each major card brand range slightly. Organizations seeking flexibility in this area should review the individual requirements for each card brand.
The PCI DSS requirements apply to all system components, including people, processes and technologies that store, process or transmit cardholder data or sensitive authentication data, included in or connected to the cardholder data environment.
Vulnerabilities are constantly found by malicious individuals and researchers, and new software is introduced to them. System components, processes, and custom applications should be periodically reviewed to ensure an evolving environment continues to represent security controls.