Domain-based Message Authentication, Reporting and Conformance (DMARC) is an email-validation system designed to detect and prevent email spoofing by building upon Domain Keys Identified Mail (DKIM) and Sender Policy Framework (SPF).
Due to rapid increases in attacks such as spam and phishing, users are becoming more and more wary of incoming messages, which can heavily impact companies that rely on email marketing.
Here is an example of a Gmail phishing attack that targeted nearly 1 billion users worldwide:
Email is easy to spoof, and these cyber-criminals are often found exploiting the trust of well-known brands such as Apple or Microsoft, leaving users unable to tell a real message from a fake one. Even mailbox servers can struggle to tell the difference, leading to genuine emails being dumped into the 'spam' folder never to be read. DMARC tackles this issue by allowing a sender's domain to indicate that their emails are protected by SPF or DKIM to show recipients that the mail can be trusted, and to instruct servers on how to handle the mail correctly.
So, to break it down, DMARC helps senders by validating their mail, allowing recipients to trust their domain. For businesses, this means a potential massive increase in opened mail and better customer relationships.
DMARC helps receivers by differentiating between genuine mail and spoof mail, helping to avoid email-borne attacks such as phishing, which can have devastating consequences on companies and individuals alike.