Email Security: Importance of DMARC and DKIM

During penetration testing engagements, we often see firsthand how easy it can be to spoof the sender address in email-based messages when Domain-based Message Authentication, Reporting, and Conformance (DMARC) and DomainKeys Identified Mail (DKIM) are not properly configured.

These protocols are critical for email security. The DKIM protocol verifies the sender is authentic, while the DMARC protocol ensures only authorized sources can send email-based messages on behalf of your organization.

Without these protocols, attackers can potentially impersonate your organization, leading to phishing, data breaches, business email compromise, or reputational damage. Implementing DMARC and DKIM isn’t just a checkbox—it’s a proactive step to protect your business and customers.

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