Task 4: You need to block users from sending emails containing information that is subject to...

To block users from sending emails containing information subject to the Payment Card Industry Data Security Standard (PCI DSS), you can create a Data Loss Prevention (DLP) policy in Microsoft Exchange Online. Here’s how:

Create a Custom DLP Policy:

Log in to the Microsoft Exchange Online admin center.

Navigate to Data loss prevention > Policy.

Create a new custom policy specifically for PCI DSS compliance.

Define Conditions:

In the policy settings, define conditions that identify sensitive data related to PCI DSS. For example:

Keywords: Include terms like “credit card,” “debit card,” or specific card number formats.

Regular Expressions (Regex): Craft expressions to match credit card patterns (e.g., \b\d{4}-\d{4}-\d{4}-\d{4}\b for Visa/Mastercard).

Sensitive Information Types: Use built-in or custom sensitive information types related to payment cards.

Choose Actions:

Specify the actions to take when sensitive data is detected in emails:

Block: Prevent the email from being sent.

Notify Sender: Inform the sender that sensitive data is not allowed via email.

Add Disclaimer/Watermark: Optionally add a disclaimer or watermark to the email.

Apply the Policy to Emails Only:

Ensure that the policy is configured to apply only to emails (not other communication channels).

Exclude internal communication if necessary.

Test and Monitor:

Enable the policy in test mode initially to validate its effectiveness.

Monitor logs and adjust the policy as needed.